Flake8 CI fixes (#451)

* Pep8 fixes

* tox Pep8 compliance

* Excluded external tools folder from flake 8 tests

* Added Flake 8 exclusions

* Pep8 fixes

* Pep8 fixes

* Corrected type

* Pep8 fixes

* Pep 8 compliance

* Pep8 fixes

* Pep8  fixes

* Pep8 fixes

* Pep8 fixes

* Pep 8 fixes

* Pep 8 fixes

* Pep8 fixes

* Pep8 fixes

* Pep8 fixes

* Pep8

* Pep8

* Pep 8

* Pep 8

* Pep8 fixes

* Pep8

* Pep8

* Pep8

* Pep8 fixes

* Pep8 fixes

* Pep8 fixes

* Pep8 fixes

* Pep8 fixes

* Revert chagnes

* Revert changes to kivy/__init.py

* Revert changes

* REvert changes

* Revert changes

* Revert changes to toolchain

* Add files exclusions to tox.ini

* Added exclusions for alias recipes

* Remove dead code

* Added py extension to recipes

* Removed recipe build skip

* Improves recipe matching

Previous expression was matching all the following three lines of a `git diff --name-only` output.
```
recipes/hostlibffi/__init__.py
recipes/hostpython.py
recipes/hostpython2/__init__.py
```
This was resulting to a bug when later splitting with `recipe = file_path.split('/')[1]` the `recipes/hostpython.py` string would return including the `\n` new line char, see:
 ```
>>> 'recipes/hostpython.py\n'.split('/')[1]
'hostpython.py\n'
>>> 'recipes/hostlibffi/__init__.py\n'.split('/')[1]
'hostlibffi'
>>> 
```

Co-authored-by: Andre Miras <AndreMiras@users.noreply.github.com>

.ci/rebuild_updated_recipes.py

@@ -1,6 +1,7 @@
 import sh
-import shutil
 import subprocess
+from fnmatch import fnmatch
+
 
 def modified_recipes(branch='origin/master'):
     """
@@ -14,11 +15,12 @@ def modified_recipes(branch='origin/master'):
     git_diff = sh.contrib.git.diff('--name-only', branch)
     recipes = set()
     for file_path in git_diff:
-        if 'recipes/' in file_path:
+        if fnmatch(file_path, "recipes/*/__init__.py\n"):
             recipe = file_path.split('/')[1]
             recipes.add(recipe)
     return recipes
 
+
 if __name__ == "__main__":
     updated_recipes = " ".join(modified_recipes())
     if updated_recipes != '':

recipes/audiostream/__init__.py

@@ -10,4 +10,3 @@ class AudiostreamRecipe(CythonRecipe):
 
 
 recipe = AudiostreamRecipe()
-

recipes/click/__init__.py

@@ -1,7 +1,9 @@
 # pure-python package, this can be removed when we'll support any python package
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class ClickRecipe(PythonRecipe):
     version = "master"
@@ -20,5 +22,5 @@ class ClickRecipe(PythonRecipe):
         shprint(cmd, "-i", "", "s/setuptools/distutils.core/g", "./setup.py", _env=build_env)
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
-recipe = ClickRecipe()
 
+recipe = ClickRecipe()

recipes/curly/__init__.py

@@ -1,5 +1,6 @@
 from toolchain import CythonRecipe
 
+
 class CurlyRecipe(CythonRecipe):
     version = "master"
     url = "https://github.com/tito/curly/archive/{version}.zip"

recipes/cymunk/__init__.py

@@ -3,10 +3,7 @@ Author: Lawrence Du, Lukasz Mach
 E-mail: larrydu88@gmail.com, maho@pagema.net
 """
 
-from toolchain import CythonRecipe,shprint
+from toolchain import CythonRecipe
-import os
-from os.path import join
-import sh
 
 
 class CymunkRecipe(CythonRecipe):

recipes/distribute/__init__.py

@@ -1,6 +1,8 @@
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class DistributeRecipe(PythonRecipe):
     version = "0.7.3"
@@ -18,4 +20,5 @@ class DistributeRecipe(PythonRecipe):
         build_env['PYTHONPATH'] = join(dest_dir, 'lib', 'python2.7', 'site-packages')
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
+
 recipe = DistributeRecipe()

recipes/ffmpeg/__init__.py

@@ -1,5 +1,5 @@
 from toolchain import Recipe, shprint
-from os.path import join, exists
+from os.path import join
 import sh
 
 

recipes/ffpyplayer/__init__.py

@@ -1,6 +1,5 @@
-from toolchain import CythonRecipe, shprint
+from toolchain import CythonRecipe
 from os.path import join
-import sh
 
 
 class FFPyplayerRecipe(CythonRecipe):
@@ -34,4 +33,3 @@ class FFPyplayerRecipe(CythonRecipe):
 
 
 recipe = FFPyplayerRecipe()
-

recipes/flask/__init__.py

@@ -1,12 +1,14 @@
 # pure-python package, this can be removed when we'll support any python package
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class FlaskRecipe(PythonRecipe):
     version = "master"
     url = "https://github.com/mitsuhiko/flask/archive/{version}.zip"
-    depends = ["python","jinja2","werkzeug","itsdangerous","click"]
+    depends = ["python", "jinja2", "werkzeug", "itsdangerous", "click"]
 
     def install(self):
         arch = list(self.filtered_archs)[0]
@@ -20,5 +22,5 @@ class FlaskRecipe(PythonRecipe):
         shprint(cmd, "-i", "", "s/setuptools/distutils.core/g", "./setup.py", _env=build_env)
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
-recipe = FlaskRecipe()
 
+recipe = FlaskRecipe()

recipes/freetype/__init__.py

@@ -32,4 +32,3 @@ class FreetypeRecipe(Recipe):
 
 
 recipe = FreetypeRecipe()
-

recipes/host_setuptools/__init__.py

@@ -1,8 +1,7 @@
 from toolchain import Recipe, shprint
-from os.path import join, exists
+from os.path import join
 import sh
 import os
-import fnmatch
 import shutil
 
 
@@ -31,4 +30,5 @@ class HostSetuptools(Recipe):
         os.remove('easy-install.pth')
         shutil.rmtree('EGG-INFO')
 
+
 recipe = HostSetuptools()

recipes/hostlibffi/__init__.py

@@ -5,6 +5,7 @@ import logging
 
 logger = logging.getLogger(__name__)
 
+
 class LibffiRecipe(Recipe):
     version = "3.2.1"
     url = "ftp://sourceware.org/pub/libffi/libffi-{version}.tar.gz"
@@ -29,7 +30,7 @@ class LibffiRecipe(Recipe):
             return
         # necessary as it doesn't compile with XCode 6.0. If we use 5.1.1, the
         # compiler for i386 is not working.
-        #shprint(sh.sed,
+        # shprint(sh.sed,
         #        "-i.bak",
         #        "s/-miphoneos-version-min=5.1.1/-miphoneos-version-min=6.0/g",
         #        "generate-darwin-source-and-headers.py")
@@ -63,4 +64,5 @@ class LibffiRecipe(Recipe):
     def postbuild_arch(self, arch):
         pass
 
+
 recipe = LibffiRecipe()

recipes/hostpython.py

@@ -5,6 +5,7 @@ import logging
 
 logger = logging.getLogger(__name__)
 
+
 class HostpythonAliasRecipe(Recipe):
     is_alias = True
 
@@ -24,4 +25,5 @@ class HostpythonAliasRecipe(Recipe):
         if hostpython:
             self.depends = [hostpython]
 
+
 recipe = HostpythonAliasRecipe()

recipes/hostpython2/_scproxy.py

@@ -3,8 +3,10 @@ Stub functions for _scproxy on OsX
 No proxy is supported yet.
 '''
 
+
 def _get_proxy_settings():
     return {'exclude_simple': 1}
 
+
 def _get_proxies():
     return {}

recipes/ios/src/setup.py

@@ -1,13 +1,13 @@
 from distutils.core import setup, Extension
-import os
+
 
 setup(name='ios',
       version='1.1',
       ext_modules=[
-        Extension(
+          Extension('ios',
-            'ios', ['ios.c', 'ios_utils.m', 'ios_mail.m', 'ios_browser.m',
+                    ['ios.c', 'ios_utils.m', 'ios_mail.m', 'ios_browser.m',
                      'ios_filechooser.m'],
-            libraries=[ ],
+                    libraries=[],
                     library_dirs=[],
                     )
                   ]

recipes/itsdangerous/__init__.py

@@ -1,7 +1,9 @@
 # pure-python package, this can be removed when we'll support any python package
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class ItsDangerousRecipe(PythonRecipe):
     version = "master"
@@ -20,5 +22,5 @@ class ItsDangerousRecipe(PythonRecipe):
         shprint(cmd, "-i", "", "s/setuptools/distutils.core/g", "./setup.py", _env=build_env)
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
-recipe = ItsDangerousRecipe()
 
+recipe = ItsDangerousRecipe()

recipes/jinja2/__init__.py

@@ -1,12 +1,14 @@
 # pure-python package, this can be removed when we'll support any python package
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class Jinja2Recipe(PythonRecipe):
     version = "master"
     url = "https://github.com/mitsuhiko/jinja2/archive/{version}.zip"
-    depends = ["python","markupsafe"]
+    depends = ["python", "markupsafe"]
 
     def install(self):
         arch = list(self.filtered_archs)[0]
@@ -20,5 +22,5 @@ class Jinja2Recipe(PythonRecipe):
         shprint(cmd, "-i", "", "s/setuptools/distutils.core/g", "./setup.py", _env=build_env)
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
-recipe = Jinja2Recipe()
 
+recipe = Jinja2Recipe()

recipes/kivent_core/__init__.py

@@ -6,7 +6,7 @@ E-mail: larrydu88@gmail.com
 from toolchain import CythonRecipe, shprint
 import sh
 from os.path import join
-from os import environ, chdir
+from os import chdir
 import logging
 
 logger = logging.getLogger(__name__)
@@ -16,46 +16,41 @@ class KiventCoreRecipe(CythonRecipe):
     version = 'master'
     url = 'https://github.com/kivy/kivent/archive/{version}.zip'
     name = 'kivent_core'
-    depends = ['libffi','kivy'] #note: unsure if libffi is necessary here
+    depends = ['libffi', 'kivy']  # note: unsure if libffi is necessary here
-    pre_build_ext=False
+    pre_build_ext = False
     subbuilddir = False
     cythonize = True
-    pbx_frameworks = ["OpenGLES"] #note: This line may be unnecessary
+    pbx_frameworks = ["OpenGLES"]  # note: This line may be unnecessary
-
 
     def get_recipe_env(self, arch):
-        env = super(KiventCoreRecipe,self).get_recipe_env(arch)
+        env = super(KiventCoreRecipe, self).get_recipe_env(arch)
         env['CYTHONPATH'] = self.get_recipe(
             'kivy', self.ctx).get_build_dir(arch.arch)
         return env
 
-
+    def get_build_dir(self, arch, sub=False):
-    def get_build_dir(self,arch, sub=False):
         """
         Call this to get the correct build_dir, where setup.py is located which is
         actually under modules/core/setup.py
         """
         builddir = super(KiventCoreRecipe, self).get_build_dir(str(arch))
         if sub or self.subbuilddir:
-            core_build_dir = join (builddir, 'modules', 'core')
+            core_build_dir = join(builddir, 'modules', 'core')
             logger.info("Core build directory is located at {}".format(core_build_dir))
             return core_build_dir
         else:
             logger.info("Building in {}".format(builddir))
             return builddir
 
-
     def build_arch(self, arch):
         """
         Override build.arch to avoid calling setup.py here (Call it in
         install() instead).
         """
-
         self.subbuildir = True
         self.cythonize_build()
         self.biglink()
-        self.subbuilddir=False
+        self.subbuilddir = False
-
 
     def install(self):
         """
@@ -73,35 +68,35 @@ class KiventCoreRecipe(CythonRecipe):
         """
         arch = list(self.filtered_archs)[0]
 
-        build_dir = self.get_build_dir(arch.arch,sub=True)
+        build_dir = self.get_build_dir(arch.arch, sub=True)
-        logger.info("Building kivent_core {} in {}".format(arch.arch,build_dir))
+        logger.info("Building kivent_core {} in {}".format(arch.arch, build_dir))
         chdir(build_dir)
         hostpython = sh.Command(self.ctx.hostpython)
 
-        #Get the appropriate environment for this recipe (including CYTHONPATH)
+        # Get the appropriate environment for this recipe (including CYTHONPATH)
-        #build_env = arch.get_env()
+        # build_env = arch.get_env()
         build_env = self.get_recipe_env(arch)
 
-        dest_dir = join (self.ctx.dist_dir, "root", "python")
+        dest_dir = join(self.ctx.dist_dir, "root", "python")
         build_env['PYTHONPATH'] = join(dest_dir, 'lib', 'python2.7', 'site-packages')
 
-        #Add Architecture specific kivy path for 'import kivy' to PYTHONPATH
+        # Add Architecture specific kivy path for 'import kivy' to PYTHONPATH
         arch_kivy_path = self.get_recipe('kivy', self.ctx).get_build_dir(arch.arch)
-        build_env['PYTHONPATH'] = join( build_env['PYTHONPATH'],':',arch_kivy_path)
+        build_env['PYTHONPATH'] = join(build_env['PYTHONPATH'], ':', arch_kivy_path)
 
-        #Make sure you call kivent_core/modules/core/setup.py
+        # Make sure you call kivent_core/modules/core/setup.py
-        subdir_path = self.get_build_dir(str(arch),sub=True)
+        subdir_path = self.get_build_dir(str(arch), sub=True)
-        setup_path = join(subdir_path,"setup.py")
+        setup_path = join(subdir_path, "setup.py")
 
-
+        # Print out directories for sanity check
-        #Print out directories for sanity check
         logger.info("ENVS", build_env)
-        logger.info("ROOT",self.ctx.root_dir)
+        logger.info("ROOT", self.ctx.root_dir)
-        logger.info("BUILD",self.ctx.build_dir)
+        logger.info("BUILD", self.ctx.build_dir)
         logger.info("INCLUDE", self.ctx.include_dir)
         logger.info("DISTDIR", self.ctx.dist_dir)
-        logger.info("ARCH KIVY LOC",self.get_recipe('kivy', self.ctx).get_build_dir(arch.arch))
+        logger.info("ARCH KIVY LOC", self.get_recipe('kivy', self.ctx).get_build_dir(arch.arch))
 
         shprint(hostpython, setup_path, "build_ext", "install", _env=build_env)
 
+
 recipe = KiventCoreRecipe()

recipes/libcurl/__init__.py

@@ -1,7 +1,6 @@
 from toolchain import Recipe, shprint
-from os.path import join, exists
+from os.path import join
 import sh
-import os
 
 
 class CurlRecipe(Recipe):
@@ -11,7 +10,6 @@ class CurlRecipe(Recipe):
     include_dir = "include"
     depends = ["openssl"]
 
-
     def build_arch(self, arch):
         build_env = arch.get_env()
         configure = sh.Command(join(self.build_dir, "configure"))
@@ -27,6 +25,5 @@ class CurlRecipe(Recipe):
         shprint(sh.make, "clean")
         shprint(sh.make, self.ctx.concurrent_make)
 
+
 recipe = CurlRecipe()
-
-

recipes/libjpeg/__init__.py

@@ -1,7 +1,6 @@
 from toolchain import Recipe, shprint
-from os.path import join, exists
+from os.path import join
 import sh
-import os
 
 
 class JpegRecipe(Recipe):
@@ -16,7 +15,6 @@ class JpegRecipe(Recipe):
         ]
     include_per_arch = True
 
-
     def build_arch(self, arch):
         build_env = arch.get_env()
         configure = sh.Command(join(self.build_dir, "configure"))
@@ -31,6 +29,5 @@ class JpegRecipe(Recipe):
         shprint(sh.make, "clean")
         shprint(sh.make, self.ctx.concurrent_make)
 
+
 recipe = JpegRecipe()
-
-

recipes/libpng/__init__.py

@@ -3,6 +3,7 @@ from toolchain import Recipe, shprint
 from os.path import join
 import sh
 
+
 class PngRecipe(Recipe):
     version = '1.6.26'
     url = 'http://downloads.sourceforge.net/sourceforge/libpng/libpng-{version}.tar.gz'
@@ -23,4 +24,5 @@ class PngRecipe(Recipe):
         shprint(sh.make, "clean")
         shprint(sh.make, self.ctx.concurrent_make, _env=build_env)
 
+
 recipe = PngRecipe()

recipes/libzbar/__init__.py

@@ -1,7 +1,7 @@
-from toolchain import Recipe,shprint
+from toolchain import Recipe, shprint
 from os.path import join
 import sh
-import os
+
 
 class LibZBarRecipe(Recipe):
 
@@ -28,11 +28,12 @@ class LibZBarRecipe(Recipe):
         super(LibZBarRecipe, self).build_arch(arch)
         build_env = arch.get_env()
         build_env["CFLAGS"] = " ".join([
-            "-I{}".format(join(self.ctx.dist_dir, "build","libiconv",arch.arch)) +
+            "-I{}".format(join(self.ctx.dist_dir, "build", "libiconv", arch.arch)) +
-            " -arch {}".format(arch.arch),build_env['CFLAGS']
+            " -arch {}".format(arch.arch), build_env['CFLAGS']
             ])
-        shprint(sh.Command('autoreconf') ,'-vif')
+        shprint(sh.Command('autoreconf'), '-vif')
-        shprint(sh.Command('./configure'),
+        shprint(
+            sh.Command('./configure'),
             "CC={}".format(build_env["CC"]),
             "LD={}".format(build_env["LD"]),
             "CFLAGS={}".format(build_env["CFLAGS"]),
@@ -53,4 +54,5 @@ class LibZBarRecipe(Recipe):
         shprint(sh.make, 'clean')
         shprint(sh.make, _env=build_env)
 
+
 recipe = LibZBarRecipe()

recipes/markupsafe/__init__.py

@@ -1,7 +1,9 @@
 # pure-python package, this can be removed when we'll support any python package
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class MarkupSafeRecipe(PythonRecipe):
     version = "master"
@@ -20,9 +22,8 @@ class MarkupSafeRecipe(PythonRecipe):
         shprint(cmd, "-i", "", "s/,.*Feature//g", "./setup.py", _env=build_env)
         shprint(cmd, "-i", "", "s/setuptools/distutils.core/g", "./setup.py", _env=build_env)
         shprint(cmd, "-i", "", "/^speedups = Feature/,/^)$/s/.*//g", "./setup.py", _env=build_env)
-        shprint(cmd, "-i", "", "s/features\['speedups'\].*=.*speedups/pass/g", "./setup.py", _env=build_env)
+        shprint(cmd, "-i", "", "s/features\['speedups'\].*=.*speedups/pass/g", "./setup.py", _env=build_env)  # noqa: W605
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
 
 recipe = MarkupSafeRecipe()
-

recipes/numpy/__init__.py

@@ -1,6 +1,5 @@
-from toolchain import CythonRecipe, shprint
+from toolchain import CythonRecipe
 from os.path import join
-from os import chdir, listdir
 import sh
 import shutil
 

recipes/openssl/__init__.py

@@ -32,4 +32,5 @@ class OpensslRecipe(Recipe):
         shprint(sh.make, "clean")
         shprint(sh.make, self.ctx.concurrent_make, "build_libs")
 
+
 recipe = OpensslRecipe()

recipes/photolibrary/__init__.py

@@ -11,6 +11,5 @@ class PhotoRecipe(CythonRecipe):
     def install(self):
         self.install_python_package(name="photolibrary.so", is_dir=False)
 
+
 recipe = PhotoRecipe()
-
-

recipes/pil/__init__.py

@@ -8,7 +8,7 @@ import fnmatch
 class PillowRecipe(Recipe):
     version = "2.8.2"
     url = "https://pypi.python.org/packages/source/P/Pillow/Pillow-{version}.tar.gz"
-    #url = "https://github.com/python-pillow/Pillow/archive/{version}.tar.gz"
+    # url = "https://github.com/python-pillow/Pillow/archive/{version}.tar.gz"
     library = "libpil.a"
     depends = ["hostpython", "host_setuptools", "pkgresources", "freetype", "libjpeg", "python", "ios"]
     pbx_libraries = ["libz", "libbz2"]
@@ -33,9 +33,9 @@ class PillowRecipe(Recipe):
     def build_arch(self, arch):
         self.apply_patch('pil_setup.patch')
         build_env = self.get_pil_env(arch)
-        #build_dir = self.get_build_dir(arch.arch)
+        # build_dir = self.get_build_dir(arch.arch)
         hostpython = sh.Command(self.ctx.hostpython)
-        #build_env["PYTHONHOME"] = hostpython
+        # build_env["PYTHONHOME"] = hostpython
         # first try to generate .h
         shprint(hostpython, "setup.py", "build_ext", "-g",
                 _env=build_env)
@@ -61,5 +61,5 @@ class PillowRecipe(Recipe):
         cmd = sh.Command(join(self.ctx.root_dir, "tools", "biglink"))
         shprint(cmd, join(self.build_dir, "libpil.a"), *dirs)
 
-recipe = PillowRecipe()
 
+recipe = PillowRecipe()

recipes/pillow/__init__.py

@@ -56,5 +56,5 @@ class PillowRecipe(Recipe):
         cmd = sh.Command(join(self.ctx.root_dir, "tools", "biglink"))
         shprint(cmd, join(self.build_dir, "libpillow.a"), *dirs)
 
-recipe = PillowRecipe()
 
+recipe = PillowRecipe()

recipes/pkgresources/__init__.py

@@ -1,4 +1,4 @@
-from toolchain import Recipe, shprint
+from toolchain import Recipe
 from os.path import join
 import sh
 

recipes/pkgresources/pkg_resources.py

@@ -1,4 +1,4 @@
-"""
+"""  # noqa E902
 Package resource API
 --------------------
 
@@ -10,7 +10,7 @@ names being passed into the API.
 
 The package resource API is designed to work with normal filesystem packages,
 .egg files, and unpacked .egg files.  It can also work in a limited way with
-.zip files and with custom PEP 302 loaders that support the ``get_data()``
+.zip files and with custom PEP 302 loaders that support the ``get_data()``.
 method.
 """
 
@@ -41,8 +41,7 @@ PY2 = not PY3
 
 if PY3:
     from urllib.parse import urlparse, urlunparse
-
+else:
-if PY2:
     from urlparse import urlparse, urlunparse
 
 if PY3:
@@ -76,10 +75,12 @@ except ImportError:
 
 _state_vars = {}
 
+
 def _declare_state(vartype, **kw):
     globals().update(kw)
     _state_vars.update(dict.fromkeys(kw, vartype))
 
+
 def __getstate__():
     state = {}
     g = globals()
@@ -87,25 +88,31 @@ def __getstate__():
         state[k] = g['_sget_'+v](g[k])
     return state
 
+
 def __setstate__(state):
     g = globals()
     for k, v in state.items():
         g['_sset_'+_state_vars[k]](k, g[k], v)
     return state
 
+
 def _sget_dict(val):
     return val.copy()
 
+
 def _sset_dict(key, ob, state):
     ob.clear()
     ob.update(state)
 
+
 def _sget_object(val):
     return val.__getstate__()
 
+
 def _sset_object(key, ob, state):
     ob.__setstate__(state)
 
+
 _sget_none = _sset_none = lambda *args: None
 
 
@@ -132,6 +139,7 @@ def get_supported_platform():
             pass
     return plat
 
+
 __all__ = [
     # Basic resource access and distribution/entry point discovery
     'require', 'run_script', 'get_provider', 'get_distribution',
@@ -175,19 +183,25 @@ __all__ = [
     'run_main', 'AvailableDistributions',
 ]
 
+
 class ResolutionError(Exception):
     """Abstract base for dependency resolution errors"""
     def __repr__(self):
         return self.__class__.__name__+repr(self.args)
 
+
 class VersionConflict(ResolutionError):
     """An already-installed version conflicts with the requested version"""
 
+
 class DistributionNotFound(ResolutionError):
     """A requested distribution was not found"""
 
+
 class UnknownExtra(ResolutionError):
     """Distribution doesn't have an "extra feature" of the given name"""
+
+
 _provider_factories = {}
 
 PY_MAJOR = sys.version[:3]
@@ -197,6 +211,7 @@ SOURCE_DIST = 1
 CHECKOUT_DIST = 0
 DEVELOP_DIST = -1
 
+
 def register_loader_type(loader_type, provider_factory):
     """Register `provider_factory` to make providers for `loader_type`
 
@@ -206,6 +221,7 @@ def register_loader_type(loader_type, provider_factory):
     """
     _provider_factories[loader_type] = provider_factory
 
+
 def get_provider(moduleOrReq):
     """Return an IResourceProvider for the named module or requirement"""
     if isinstance(moduleOrReq, Requirement):
@@ -218,6 +234,7 @@ def get_provider(moduleOrReq):
     loader = getattr(module, '__loader__', None)
     return _find_adapter(_provider_factories, loader)(module)
 
+
 def _macosx_vers(_cache=[]):
     if not _cache:
         version = platform.mac_ver()[0]
@@ -233,9 +250,11 @@ def _macosx_vers(_cache=[]):
         _cache.append(version.split('.'))
     return _cache[0]
 
+
 def _macosx_arch(machine):
     return {'PowerPC': 'ppc', 'Power_Macintosh': 'ppc'}.get(machine, machine)
 
+
 def get_build_platform():
     """Return this platform's string for platform-specific distributions
 
@@ -261,6 +280,7 @@ def get_build_platform():
             pass
     return plat
 
+
 macosVersionString = re.compile(r"macosx-(\d+)\.(\d+)-(.*)")
 darwinVersionString = re.compile(r"darwin-(\d+)\.(\d+)\.(\d+)-(.*)")
 # XXX backward compat
@@ -274,7 +294,7 @@ def compatible_platforms(provided, required):
 
     XXX Needs compatibility checks for Linux and other unixy OSes.
     """
-    if provided is None or required is None or provided==required:
+    if provided is None or required is None or provided == required:
         # easy case
         return True
 
@@ -321,9 +341,11 @@ def run_script(dist_spec, script_name):
     ns['__name__'] = name
     require(dist_spec)[0].run_script(script_name, ns)
 
+
 # backward compatibility
 run_main = run_script
 
+
 def get_distribution(dist):
     """Return a current distribution object for a Requirement or string"""
     if isinstance(dist, string_types):
@@ -334,14 +356,17 @@ def get_distribution(dist):
         raise TypeError("Expected string, Requirement, or Distribution", dist)
     return dist
 
+
 def load_entry_point(dist, group, name):
     """Return `name` entry point of `group` for `dist` or raise ImportError"""
     return get_distribution(dist).load_entry_point(group, name)
 
+
 def get_entry_map(dist, group=None):
     """Return the entry point map for `group`, or the full entry map"""
     return get_distribution(dist).get_entry_map(group)
 
+
 def get_entry_info(dist, group, name):
     """Return the EntryPoint object for `group`+`name`, or ``None``"""
     return get_distribution(dist).get_entry_info(group, name)
@@ -530,7 +555,7 @@ class WorkingSet(object):
 
             for key in self.entry_keys[item]:
                 if key not in seen:
-                    seen[key]=1
+                    seen[key] = 1
                     yield self.by_key[key]
 
     def add(self, dist, entry=None, insert=True, replace=False):
@@ -550,8 +575,8 @@ class WorkingSet(object):
 
         if entry is None:
             entry = dist.location
-        keys = self.entry_keys.setdefault(entry,[])
+        keys = self.entry_keys.setdefault(entry, [])
-        keys2 = self.entry_keys.setdefault(dist.location,[])
+        keys2 = self.entry_keys.setdefault(dist.location, [])
         if not replace and dist.key in self.by_key:
             # ignore hidden distros
             return
@@ -617,10 +642,6 @@ class WorkingSet(object):
                             ws = WorkingSet([])
                     dist = best[req.key] = env.best_match(req, ws, installer)
                     if dist is None:
-                        #msg = ("The '%s' distribution was not found on this "
-                        #       "system, and is required by this application.")
-                        #raise DistributionNotFound(msg % req)
-
                         # unfortunately, zc.buildout uses a str(err)
                         # to get the name of the distribution here..
                         raise DistributionNotFound(req)
@@ -805,7 +826,7 @@ class Environment(object):
         is returned.
         """
         return (self.python is None or dist.py_version is None
-            or dist.py_version==self.python) \
+                or dist.py_version == self.python) \
             and compatible_platforms(dist.platform, self.platform)
 
     def remove(self, dist):
@@ -1012,7 +1033,7 @@ variable to point to an accessible directory.
         target_path = os.path.join(extract_path, archive_name+'-tmp', *names)
         try:
             _bypass_ensure_directory(target_path)
-        except:
+        except Exception:
             self.extraction_error()
 
         self._warn_unsafe_extraction_path(extract_path)
@@ -1103,6 +1124,7 @@ variable to point to an accessible directory.
         """
         # XXX
 
+
 def get_default_cache():
     """Determine the default cache location
 
@@ -1115,7 +1137,7 @@ def get_default_cache():
     except KeyError:
         pass
 
-    if os.name!='nt':
+    if os.name != 'nt':
         return os.path.expanduser('~/.python-eggs')
 
     # XXX this may be locale-specific!
@@ -1124,7 +1146,7 @@ def get_default_cache():
         # best option, should be locale-safe
         (('APPDATA',), None),
         (('USERPROFILE',), app_data),
-        (('HOMEDRIVE','HOMEPATH'), app_data),
+        (('HOMEDRIVE', 'HOMEPATH'), app_data),
         (('HOMEPATH',), app_data),
         (('HOME',), None),
         # 95/98/ME
@@ -1147,6 +1169,7 @@ def get_default_cache():
             "Please set the PYTHON_EGG_CACHE enviroment variable"
         )
 
+
 def safe_name(name):
     """Convert an arbitrary string to a standard distribution name
 
@@ -1161,7 +1184,7 @@ def safe_version(version):
     Spaces become dots, and all other non-alphanumeric characters become
     dashes, with runs of multiple dashes condensed to a single dash.
     """
-    version = version.replace(' ','.')
+    version = version.replace(' ', '.')
     return re.sub('[^A-Za-z0-9.]+', '-', version)
 
 
@@ -1179,7 +1202,7 @@ def to_filename(name):
 
     Any '-' characters are currently replaced with '_'.
     """
-    return name.replace('-','_')
+    return name.replace('-', '_')
 
 
 class MarkerEvaluation(object):
@@ -1325,11 +1348,12 @@ class MarkerEvaluation(object):
     if 'parser' not in globals():
         # Fall back to less-complete _markerlib implementation if 'parser' module
         # is not available.
-        evaluate_marker = _markerlib_evaluate
+        evaluate_marker = _markerlib_evaluate  # noqa: F811
 
     @classmethod
     def interpret(cls, nodelist):
-        while len(nodelist)==2: nodelist = nodelist[1]
+        while len(nodelist) == 2:
+            nodelist = nodelist[1]
         try:
             op = cls.get_op(nodelist[0])
         except KeyError:
@@ -1338,16 +1362,17 @@ class MarkerEvaluation(object):
 
     @classmethod
     def evaluate(cls, nodelist):
-        while len(nodelist)==2: nodelist = nodelist[1]
+        while len(nodelist) == 2:
+            nodelist = nodelist[1]
         kind = nodelist[0]
         name = nodelist[1]
-        if kind==token.NAME:
+        if kind == token.NAME:
             try:
                 op = cls.values[name]
             except KeyError:
                 raise SyntaxError("Unknown name %r" % name)
             return op()
-        if kind==token.STRING:
+        if kind == token.STRING:
             s = nodelist[1]
             if not cls._safe_string(s):
                 raise SyntaxError(
@@ -1365,9 +1390,11 @@ class MarkerEvaluation(object):
             '\\' not in cand
         )
 
+
 invalid_marker = MarkerEvaluation.is_invalid_marker
 evaluate_marker = MarkerEvaluation.evaluate_marker
 
+
 class NullProvider:
     """Try to implement resources and metadata for arbitrary PEP 302 loaders"""
 
@@ -1439,7 +1466,7 @@ class NullProvider:
             cache[script_filename] = (
                 len(script_text), 0, script_text.split('\n'), script_filename
             )
-            script_code = compile(script_text, script_filename,'exec')
+            script_code = compile(script_text, script_filename, 'exec')
             exec(script_code, namespace, namespace)
 
     def _has(self, path):
@@ -1465,13 +1492,7 @@ class NullProvider:
     def _get(self, path):
         if hasattr(self.loader, 'get_data'):
             return self.loader.get_data(path)
-        raise NotImplementedError(
+        raise NotImplementedError(  # noqa: F821
-            "Can't perform this operation for loaders without 'get_data()'"
-        )
-
-register_loader_type(object, NullProvider)
-
-
 class EggProvider(NullProvider):
     """Provider based on a virtual filesystem"""
 
@@ -1484,7 +1505,7 @@ class EggProvider(NullProvider):
         # of multiple eggs; that's why we use module_path instead of .archive
         path = self.module_path
         old = None
-        while path!=old:
+        while path != old:
             if path.lower().endswith('.egg'):
                 self.egg_name = os.path.basename(path)
                 self.egg_info = os.path.join(path, 'EGG-INFO')
@@ -1493,6 +1514,7 @@ class EggProvider(NullProvider):
             old = path
             path, base = os.path.split(path)
 
+
 class DefaultProvider(EggProvider):
     """Provides access to package resources in the filesystem"""
 
@@ -1512,6 +1534,7 @@ class DefaultProvider(EggProvider):
         with open(path, 'rb') as stream:
             return stream.read()
 
+
 register_loader_type(type(None), DefaultProvider)
 
 if importlib_bootstrap is not None:
@@ -1522,13 +1545,14 @@ class EmptyProvider(NullProvider):
     """Provider that returns nothing for all requests"""
 
     _isdir = _has = lambda self, path: False
-    _get = lambda self, path: ''
+    _get = lambda self, path: ''  # noqqa: E731
-    _listdir = lambda self, path: []
+    _listdir = lambda self, path: []  # noqq: E731
     module_path = None
 
     def __init__(self):
         pass
 
+
 empty_provider = EmptyProvider()
 
 
@@ -1694,7 +1718,7 @@ class ZipProvider(EggProvider):
                         #  so proceed.
                         return real_path
                     # Windows, del old file and retry
-                    elif os.name=='nt':
+                    elif os.name == 'nt':
                         unlink(real_path)
                         rename(tmpnam, real_path)
                         return real_path
@@ -1714,7 +1738,7 @@ class ZipProvider(EggProvider):
         if not os.path.isfile(file_path):
             return False
         stat = os.stat(file_path)
-        if stat.st_size!=size or stat.st_mtime!=timestamp:
+        if stat.st_size != size or stat.st_mtime != timestamp:
             return False
         # check that the contents match
         zip_contents = self.loader.get_data(zip_path)
@@ -1764,6 +1788,7 @@ class ZipProvider(EggProvider):
     def _resource_to_zip(self, resource_name):
         return self._zipinfo_name(self._fn(self.module_path, resource_name))
 
+
 register_loader_type(zipimport.zipimporter, ZipProvider)
 
 
@@ -1783,11 +1808,11 @@ class FileMetadata(EmptyProvider):
         self.path = path
 
     def has_metadata(self, name):
-        return name=='PKG-INFO'
+        return name == 'PKG-INFO'
 
     def get_metadata(self, name):
-        if name=='PKG-INFO':
+        if name == 'PKG-INFO':
-            with open(self.path,'rU') as f:
+            with open(self.path, 'rU') as f:
                 metadata = f.read()
             return metadata
         raise KeyError("No metadata except PKG-INFO is available")
@@ -1835,7 +1860,9 @@ class EggMetadata(ZipProvider):
             self.module_path = importer.archive
         self._setup_prefix()
 
-_declare_state('dict', _distribution_finders = {})
+
+_declare_state('dict', _distribution_finders={})
+
 
 def register_finder(importer_type, distribution_finder):
     """Register `distribution_finder` to find distributions in sys.path items
@@ -1844,15 +1871,16 @@ def register_finder(importer_type, distribution_finder):
     handler), and `distribution_finder` is a callable that, passed a path
     item and the importer instance, yields ``Distribution`` instances found on
     that path item.  See ``pkg_resources.find_on_path`` for an example."""
-    _distribution_finders[importer_type] = distribution_finder
+    _distribution_finders[importer_type] = distribution_finder  # noqa: F821
 
 
 def find_distributions(path_item, only=False):
     """Yield distributions accessible via `path_item`"""
     importer = get_importer(path_item)
-    finder = _find_adapter(_distribution_finders, importer)
+    finder = _find_adapter(_distribution_finders, importer)  # noqa: F821
     return finder(importer, path_item, only)
 
+
 def find_eggs_in_zip(importer, path_item, only=False):
     """
     Find eggs in zip files; possibly multiple nested eggs.
@@ -1873,12 +1901,17 @@ def find_eggs_in_zip(importer, path_item, only=False):
             for dist in find_eggs_in_zip(zipimport.zipimporter(subpath), subpath):
                 yield dist
 
+
 register_finder(zipimport.zipimporter, find_eggs_in_zip)
 
+
 def find_nothing(importer, path_item, only=False):
     return ()
+
+
 register_finder(object, find_nothing)
 
+
 def find_on_path(importer, path_item, only=False):
     """Yield distributions accessible on a sys.path directory"""
     path_item = _normalize_cached(path_item)
@@ -1888,7 +1921,7 @@ def find_on_path(importer, path_item, only=False):
             # unpacked egg
             yield Distribution.from_filename(
                 path_item, metadata=PathMetadata(
-                    path_item, os.path.join(path_item,'EGG-INFO')
+                    path_item, os.path.join(path_item, 'EGG-INFO')
                 )
             )
         else:
@@ -1920,8 +1953,11 @@ def find_on_path(importer, path_item, only=False):
                         for item in dists:
                             yield item
                         break
+
+
 register_finder(pkgutil.ImpImporter, find_on_path)
 
+
 if importlib_bootstrap is not None:
     register_finder(importlib_bootstrap.FileFinder, find_on_path)
 
@@ -1944,7 +1980,8 @@ def register_namespace_handler(importer_type, namespace_handler):
     equivalent subpath.  For an example namespace handler, see
     ``pkg_resources.file_ns_handler``.
     """
-    _namespace_handlers[importer_type] = namespace_handler
+    _namespace_handlers[importer_type] = namespace_handler  # noqa: F821
+
 
 def _handle_ns(packageName, path_item):
     """Ensure that named package includes a subpath of path_item (if needed)"""
@@ -1960,9 +1997,9 @@ def _handle_ns(packageName, path_item):
         module = sys.modules[packageName] = imp.new_module(packageName)
         module.__path__ = []
         _set_parent_ns(packageName)
-    elif not hasattr(module,'__path__'):
+    elif not hasattr(module, '__path__'):
         raise TypeError("Not a package:", packageName)
-    handler = _find_adapter(_namespace_handlers, importer)
+    handler = _find_adapter(_namespace_handlers, importer)  # noqa: F821
     subpath = handler(importer, path_item, packageName, module)
     if subpath is not None:
         path = module.__path__
@@ -1973,19 +2010,20 @@ def _handle_ns(packageName, path_item):
                 module.__path__.append(path_item)
     return subpath
 
+
 def declare_namespace(packageName):
     """Declare that package 'packageName' is a namespace package"""
 
     imp.acquire_lock()
     try:
-        if packageName in _namespace_packages:
+        if packageName in _namespace_packages:  # noqa: F821
             return
 
         path, parent = sys.path, None
         if '.' in packageName:
             parent = '.'.join(packageName.split('.')[:-1])
             declare_namespace(parent)
-            if parent not in _namespace_packages:
+            if parent not in _namespace_packages:  # noqa: F821
                 __import__(parent)
             try:
                 path = sys.modules[parent].__path__
@@ -1994,8 +2032,8 @@ def declare_namespace(packageName):
 
         # Track what packages are namespaces, so when new path items are added,
         # they can be updated
-        _namespace_packages.setdefault(parent,[]).append(packageName)
+        _namespace_packages.setdefault(parent, []).append(packageName)  # noqa: F821
-        _namespace_packages.setdefault(packageName,[])
+        _namespace_packages.setdefault(packageName, [])  # noqa: F821
 
         for path_item in path:
             # Ensure all the parent's path items are reflected in the child,
@@ -2005,29 +2043,32 @@ def declare_namespace(packageName):
     finally:
         imp.release_lock()
 
+
 def fixup_namespace_packages(path_item, parent=None):
     """Ensure that previously-declared namespace packages include path_item"""
     imp.acquire_lock()
     try:
-        for package in _namespace_packages.get(parent,()):
+        for package in _namespace_packages.get(parent, ()):  # noqa: F821
             subpath = _handle_ns(package, path_item)
             if subpath:
                 fixup_namespace_packages(subpath, package)
     finally:
         imp.release_lock()
 
+
 def file_ns_handler(importer, path_item, packageName, module):
     """Compute an ns-package subpath for a filesystem or zipfile importer"""
 
     subpath = os.path.join(path_item, packageName.split('.')[-1])
     normalized = _normalize_cached(subpath)
     for item in module.__path__:
-        if _normalize_cached(item)==normalized:
+        if _normalize_cached(item) == normalized:
             break
     else:
         # Only return the path if it's not already there
         return subpath
 
+
 register_namespace_handler(pkgutil.ImpImporter, file_ns_handler)
 register_namespace_handler(zipimport.zipimporter, file_ns_handler)
 
@@ -2038,6 +2079,7 @@ if importlib_bootstrap is not None:
 def null_ns_handler(importer, path_item, packageName, module):
     return None
 
+
 register_namespace_handler(object, null_ns_handler)
 
 
@@ -2045,6 +2087,7 @@ def normalize_path(filename):
     """Normalize a file/dir name for comparison purposes"""
     return os.path.normcase(os.path.realpath(filename))
 
+
 def _normalize_cached(filename, _cache={}):
     try:
         return _cache[filename]
@@ -2052,6 +2095,7 @@ def _normalize_cached(filename, _cache={}):
         _cache[filename] = result = normalize_path(filename)
         return result
 
+
 def _set_parent_ns(packageName):
     parts = packageName.split('.')
     name = parts.pop()
@@ -2073,6 +2117,7 @@ def yield_lines(strs):
             for s in yield_lines(ss):
                 yield s
 
+
 # whitespace and comment
 LINE_END = re.compile(r"\s*(#.*)?$").match
 # line continuation
@@ -2093,22 +2138,24 @@ EGG_NAME = re.compile(
 ).match
 
 component_re = re.compile(r'(\d+ | [a-z]+ | \.| -)', re.VERBOSE)
-replace = {'pre':'c', 'preview':'c','-':'final-','rc':'c','dev':'@'}.get
+replace = {'pre': 'c', 'preview': 'c', '-': 'final-', 'rc': 'c', 'dev': '@'}.get
+
 
 def _parse_version_parts(s):
     for part in component_re.split(s):
         part = replace(part, part)
-        if not part or part=='.':
+        if not part or part == '.':
             continue
         if part[:1] in '0123456789':
             # pad for numeric comparison
             yield part.zfill(8)
         else:
-            yield '*'+part
+            yield '*' + part
 
     # ensure that alpha/beta/candidate are before final
     yield '*final'
 
+
 def parse_version(s):
     """Convert a version string to a chronologically-sortable key
 
@@ -2148,7 +2195,7 @@ def parse_version(s):
                 while parts and parts[-1] == '*final-':
                     parts.pop()
             # remove trailing zeros from each series of numeric parts
-            while parts and parts[-1]=='00000000':
+            while parts and parts[-1] == '00000000':
                 parts.pop()
         parts.append(part)
     return tuple(parts)
@@ -2237,7 +2284,7 @@ class EntryPoint(object):
             ep = cls.parse(line, dist)
             if ep.name in this:
                 raise ValueError("Duplicate entry point", group, ep.name)
-            this[ep.name]=ep
+            this[ep.name] = ep
         return this
 
     @classmethod
@@ -2286,7 +2333,7 @@ class Distribution(object):
         self._provider = metadata or empty_provider
 
     @classmethod
-    def from_location(cls, location, basename, metadata=None,**kw):
+    def from_location(cls, location, basename, metadata=None, **kw):
         project_name, version, py_version, platform = [None]*4
         basename, ext = os.path.splitext(basename)
         if ext.lower() in _distributionImpl:
@@ -2294,7 +2341,7 @@ class Distribution(object):
             match = EGG_NAME(basename)
             if match:
                 project_name, version, py_version, platform = match.group(
-                    'name','ver','pyver','plat'
+                    'name', 'ver', 'pyver', 'plat'
                 )
             cls = _distributionImpl[ext.lower()]
         return cls(
@@ -2364,7 +2411,7 @@ class Distribution(object):
         except AttributeError:
             for line in self._get_metadata(self.PKG_INFO):
                 if line.lower().startswith('version:'):
-                    self._version = safe_version(line.split(':',1)[1].strip())
+                    self._version = safe_version(line.split(':', 1)[1].strip())
                     return self._version
             else:
                 tmpl = "Missing 'Version:' header and/or %s file"
@@ -2383,11 +2430,11 @@ class Distribution(object):
                             extra, marker = extra.split(':', 1)
                             if invalid_marker(marker):
                                 # XXX warn
-                                reqs=[]
+                                reqs = []
                             elif not evaluate_marker(marker):
-                                reqs=[]
+                                reqs = []
                         extra = safe_extra(extra) or None
-                    dm.setdefault(extra,[]).extend(parse_requirements(reqs))
+                    dm.setdefault(extra, []).extend(parse_requirements(reqs))
             return dm
 
     def requires(self, extras=()):
@@ -2478,14 +2525,14 @@ class Distribution(object):
                 self._get_metadata('entry_points.txt'), self
             )
         if group is not None:
-            return ep_map.get(group,{})
+            return ep_map.get(group, {})
         return ep_map
 
     def get_entry_info(self, group, name):
         """Return the EntryPoint object for `group`+`name`, or ``None``"""
         return self.get_entry_map(group).get(name)
 
-    def insert_on(self, path, loc = None):
+    def insert_on(self, path, loc=None):
         """Insert self.location in path before its nearest parent directory"""
 
         loc = loc or self.location
@@ -2494,7 +2541,7 @@ class Distribution(object):
 
         nloc = _normalize_cached(loc)
         bdir = os.path.dirname(nloc)
-        npath= [(p and _normalize_cached(p) or p) for p in path]
+        npath = [(p and _normalize_cached(p) or p) for p in path]
 
         for p, item in enumerate(npath):
             if item == nloc:
@@ -2534,7 +2581,7 @@ class Distribution(object):
         loc = normalize_path(self.location)
         for modname in self._get_metadata('top_level.txt'):
             if (modname not in sys.modules or modname in nsp
-                    or modname in _namespace_packages):
+                    or modname in _namespace_packages):  # noqa: F821
                 continue
             if modname in ('pkg_resources', 'setuptools', 'site'):
                 continue
@@ -2555,7 +2602,7 @@ class Distribution(object):
             return False
         return True
 
-    def clone(self,**kw):
+    def clone(self, **kw):
         """Copy this distribution, substituting in any changed keyword args"""
         names = 'project_name version py_version platform location precedence'
         for attr in names.split():
@@ -2618,7 +2665,7 @@ class DistInfoDistribution(Distribution):
 
         def reqs_for_extra(extra):
             for req in reqs:
-                if req.marker_fn(override={'extra':extra}):
+                if req.marker_fn(override={'extra': extra}):
                     yield req
 
         common = frozenset(reqs_for_extra(None))
@@ -2638,7 +2685,7 @@ _distributionImpl = {
     }
 
 
-def issue_warning(*args,**kw):
+def issue_warning(*args, **kw):
     level = 1
     g = globals()
     try:
@@ -2759,7 +2806,7 @@ class Requirement:
             item = parse_version(item)
         last = None
         # -1, 0, 1
-        compare = lambda a, b: (a > b) - (a < b)
+        compare = lambda a, b: (a > b) - (a < b)  # noqa: E731
         for parsed, trans, op, ver in self.index:
             # Indexing: 0, 1, -1
             action = trans[compare(item, parsed)]
@@ -2779,7 +2826,8 @@ class Requirement:
     def __hash__(self):
         return self.__hash
 
-    def __repr__(self): return "Requirement.parse(%r)" % str(self)
+    def __repr__(self):
+        return "Requirement.parse(%r)" % str(self)
 
     @staticmethod
     def parse(s):
@@ -2790,6 +2838,7 @@ class Requirement:
             raise ValueError("Expected only one requirement", s)
         raise ValueError("No requirements found", s)
 
+
 state_machine = {
     #       =><
     '<': '--T',
@@ -2804,10 +2853,12 @@ state_machine = {
 def _get_mro(cls):
     """Get an mro for a type or classic class"""
     if not isinstance(cls, type):
-        class cls(cls, object): pass
+        class cls(cls, object):
+            pass
         return cls.__mro__[1:]
     return cls.__mro__
 
+
 def _find_adapter(registry, ob):
     """Return an adapter factory for `ob` from `registry`"""
     for t in _get_mro(getattr(ob, '__class__', type(ob))):
@@ -2857,12 +2908,13 @@ def split_sections(s):
     # wrap up last segment
     yield section, content
 
-def _mkstemp(*args,**kw):
+
+def _mkstemp(*args, **kw):
     old_open = os.open
     try:
         # temporarily bypass sandboxing
         os.open = os_open
-        return tempfile.mkstemp(*args,**kw)
+        return tempfile.mkstemp(*args, **kw)
     finally:
         # and then put it back
         os.open = old_open
@@ -2870,10 +2922,14 @@ def _mkstemp(*args,**kw):
 
 # Set up global resource manager (deliberately not state-saved)
 _manager = ResourceManager()
+
+
 def _initialize(g):
     for name in dir(_manager):
         if not name.startswith('_'):
             g[name] = getattr(_manager, name)
+
+
 _initialize(globals())
 
 # Prepare the master working set and make the ``require()`` API available
@@ -2890,6 +2946,6 @@ run_main = run_script
 # all distributions added to the working set in the future (e.g. by
 # calling ``require()``) will get activated as well.
 add_activation_listener(lambda dist: dist.activate())
-working_set.entries=[]
+working_set.entries = []
 # match order
 list(map(working_set.add_entry, sys.path))

recipes/plyer/__init__.py

@@ -1,5 +1,6 @@
 from toolchain import PythonRecipe
 
+
 class PlyerRecipe(PythonRecipe):
     version = "master"
     url = "https://github.com/kivy/plyer/archive/{version}.zip"

recipes/pycrypto/__init__.py

@@ -1,7 +1,7 @@
 '''Recipe for pycrypto on ios
 '''
 from toolchain import CythonRecipe, shprint
-from os.path import join, exists
+from os.path import join
 import sh
 import os
 
@@ -11,8 +11,7 @@ class PycryptoRecipe(CythonRecipe):
     url = "https://ftp.dlitz.net/pub/dlitz/crypto/pycrypto/pycrypto-{version}.tar.gz"
     depends = ["python", "openssl"]
     include_per_arch = True
-    library="libpycrypto.a"
+    library = "libpycrypto.a"
-
 
     def build_arch(self, arch):
         build_env = arch.get_env()
@@ -26,9 +25,7 @@ class PycryptoRecipe(CythonRecipe):
                 "--prefix=/",
                 "--host={}".format(arch),
                 "ac_cv_func_malloc_0_nonnull=yes",
-                "ac_cv_func_realloc_0_nonnull=yes",
+                "ac_cv_func_realloc_0_nonnull=yes")
-               )     
-        hostpython = sh.Command(self.ctx.hostpython)
         super(PycryptoRecipe, self).build_arch(arch)
 
     def install(self):
@@ -41,5 +38,5 @@ class PycryptoRecipe(CythonRecipe):
         build_env['PYTHONPATH'] = join(dest_dir, 'lib', 'python2.7', 'site-packages')
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
-recipe = PycryptoRecipe()
 
+recipe = PycryptoRecipe()

recipes/pyobjus/__init__.py

@@ -1,5 +1,6 @@
 from toolchain import CythonRecipe
 
+
 class PyobjusRecipe(CythonRecipe):
     version = "master"
     url = "https://github.com/kivy/pyobjus/archive/{version}.zip"

recipes/python.py

@@ -6,6 +6,7 @@ from os.path import join
 
 logger = logging.getLogger(__name__)
 
+
 class PythonAliasRecipe(Recipe):
     is_alias = True
 
@@ -26,4 +27,5 @@ class PythonAliasRecipe(Recipe):
             self.depends = [python]
         self.recipe_dir = join(ctx.root_dir, "recipes", python)
 
+
 recipe = PythonAliasRecipe()

recipes/python2/__init__.py

@@ -4,8 +4,10 @@ import sh
 import os
 import logging
 
+
 logger = logging.getLogger(__name__)
 
+
 class Python2Recipe(Recipe):
     version = "2.7.1"
     url = "https://www.python.org/ftp/python/{version}/Python-{version}.tar.bz2"
@@ -88,6 +90,7 @@ class Python2Recipe(Recipe):
         # architecture can lead to different pyconfig.h, we would need one patch
         # per arch. Instead, express here the line we don't want / we want.
         pyconfig = join(self.build_dir, "pyconfig.h")
+
         def _remove_line(lines, pattern):
             for line in lines[:]:
                 if pattern in line:
@@ -130,7 +133,6 @@ class Python2Recipe(Recipe):
             os.chdir(join(self.ctx.dist_dir, "root", "python2", "lib", "python2.7"))
             sh.find(".", "-iname", "*.pyc", "-exec", "rm", "{}", ";")
             sh.find(".", "-iname", "*.py", "-exec", "rm", "{}", ";")
-            #sh.find(".", "-iname", "test*", "-exec", "rm", "-rf", "{}", ";")
             sh.rm("-rf", "wsgiref", "bsddb", "curses", "idlelib", "hotshot")
             sh.rm("-rf", sh.glob("lib*"))
 

recipes/python2/_scproxy.py

@@ -3,8 +3,10 @@ Stub functions for _scproxy on iOS
 No proxy is supported yet.
 '''
 
+
 def _get_proxy_settings():
     return {'exclude_simple': 1}
 
+
 def _get_proxies():
     return {}

recipes/python3/mock_modules/_sqlite3/__init__.py

@@ -1,2 +1,2 @@
 __version__ = 'kivy-ios'
-from ._sqlite3 import *
+from ._sqlite3 import *  # noqa: F401, F403

recipes/pyyaml/__init__.py

@@ -3,6 +3,7 @@ import os
 import sh
 from toolchain import PythonRecipe, shprint
 
+
 class PyYamlRecipe(PythonRecipe):
     version = "3.11"
     url = "https://pypi.python.org/packages/source/P/PyYAML/PyYAML-{version}.tar.gz"
@@ -18,4 +19,5 @@ class PyYamlRecipe(PythonRecipe):
         build_env['PYTHONPATH'] = os.path.join(dest_dir, 'lib', 'python2.7', 'site-packages')
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
+
 recipe = PyYamlRecipe()

recipes/sdl2_mixer/__init__.py

@@ -24,4 +24,5 @@ class LibSDL2MixerRecipe(Recipe):
                 "-target", "libSDL_mixer-iOS",
                 "-configuration", "Release")
 
+
 recipe = LibSDL2MixerRecipe()

recipes/sdl2_ttf/__init__.py

@@ -30,4 +30,5 @@ class LibSDL2TTFRecipe(Recipe):
                 join(self.get_build_dir(arch.arch), "SDL_ttf.h"),
                 join(self.ctx.include_dir, "common", "SDL2"))
 
+
 recipe = LibSDL2TTFRecipe()

recipes/werkzeug/__init__.py

@@ -1,12 +1,14 @@
 # pure-python package, this can be removed when we'll support any python package
 from toolchain import PythonRecipe, shprint
 from os.path import join
-import sh, os
+import sh
+import os
+
 
 class WerkzeugRecipe(PythonRecipe):
     version = "master"
     url = "https://github.com/mitsuhiko/werkzeug/archive/{version}.zip"
-    depends = ["python","openssl"]
+    depends = ["python", "openssl"]
 
     def install(self):
         arch = list(self.filtered_archs)[0]
@@ -18,5 +20,5 @@ class WerkzeugRecipe(PythonRecipe):
         build_env['PYTHONPATH'] = join(dest_dir, 'lib', 'python2.7', 'site-packages')
         shprint(hostpython, "setup.py", "install", "--prefix", dest_dir, _env=build_env)
 
-recipe = WerkzeugRecipe()
 
+recipe = WerkzeugRecipe()

recipes/zbarlight/__init__.py

@@ -5,12 +5,13 @@ import sh
 import fnmatch
 from distutils.dir_util import copy_tree
 
+
 class ZbarLightRecipe(Recipe):
     version = '1.2'
     url = 'https://github.com/Polyconseil/zbarlight/archive/{version}.tar.gz'
     library = "zbarlight.a"
-    depends = ['hostpython2','python2', 'libzbar']
+    depends = ['hostpython2', 'python2', 'libzbar']
-    pbx_libraries = ["libz","libbz2",'libc++','libsqlite3','CoreMotion']
+    pbx_libraries = ["libz", "libbz2", 'libc++', 'libsqlite3', 'CoreMotion']
     include_per_arch = True
 
     def get_zbar_env(self, arch):
@@ -25,7 +26,7 @@ class ZbarLightRecipe(Recipe):
         build_env["LIBRARY_PATH"] = join(arch.sysroot, "usr", "lib")
         build_env['PYTHONPATH'] = join(dest_dir, 'lib', 'python2.7', 'site-packages')
         build_env["CFLAGS"] = " ".join([
-            " -I{}".format(join(self.ctx.dist_dir, "include", arch.arch, "libzbar",'zbar')) +
+            " -I{}".format(join(self.ctx.dist_dir, "include", arch.arch, "libzbar", 'zbar')) +
             " -arch {}".format(arch.arch)
             ])
         build_env['LDFLAGS'] += " -lios -lpython -lzbar"
@@ -34,25 +35,26 @@ class ZbarLightRecipe(Recipe):
     def build_arch(self, arch):
         build_env = self.get_zbar_env(arch)
         hostpython = sh.Command(self.ctx.hostpython)
-        shprint(hostpython, "setup.py", "build",
+        shprint(hostpython, "setup.py", "build",   # noqa: F821
                 _env=build_env)
-        self.apply_patch("zbarlight_1_2.patch")#Issue getting the version, hard coding for now
+        self.apply_patch("zbarlight_1_2.patch")  # Issue getting the version, hard coding for now
         self.biglink()
 
     def install(self):
         arch = list(self.filtered_archs)[0]
-        build_dir = join(self.get_build_dir(arch.arch),'build','lib.macosx-10.13-x86_64-2.7','zbarlight')
+        build_dir = join(self.get_build_dir(arch.arch), 'build',
-        dist_dir  = join(self.ctx.dist_dir,'root','python2','lib','python2.7','site-packages','zbarlight')
+                         'lib.macosx-10.13-x86_64-2.7', 'zbarlight')
-        #Patch before Copying
+        dist_dir = join(self.ctx.dist_dir, 'root', 'python2', 'lib',
-        #self.apply_patch("zbarlight_1_2.patch")#Issue getting the version, hard coding for now
+                        'python2.7', 'site-packages', 'zbarlight')
+        # Patch before Copying
+        # self.apply_patch("zbarlight_1_2.patch")#Issue getting the version, hard coding for now
         copy_tree(build_dir, dist_dir)
-        os.remove(join(dist_dir,'_zbarlight.c'))
+        os.remove(join(dist_dir, '_zbarlight.c'))
-
 
     def _patch__init__(self):
-        init = join(self.ctx.dist_dir,'root','python2','lib','python2.7',
+        init = join(self.ctx.dist_dir, 'root', 'python2', 'lib', 'python2.7',
-                    'site-packages','zbarlight', "__init__.py")
+                    'site-packages', 'zbarlight', "__init__.py")
-        shprint(
+        shprint(  # noqa: F821
             sh.sed, "-i.bak",
             "s/__version__ = pkg_resources.get_distribution('zbarlight').version'"
             "/__version__ = '{version}'/g",
@@ -64,6 +66,7 @@ class ZbarLightRecipe(Recipe):
             if fnmatch.filter(filenames, "*.so.libs"):
                 dirs.append(root)
         cmd = sh.Command(join(self.ctx.root_dir, "tools", "biglink"))
-        shprint(cmd, join(self.build_dir, "zbarlight.a"), *dirs)
+        shprint(cmd, join(self.build_dir, "zbarlight.a"), *dirs)  # noqa: F821
+
 
 recipe = ZbarLightRecipe()

tests/test_libs/main.py

@@ -9,7 +9,7 @@ def test_kivy():
     import kivy
     import kivy.event
     import kivy.core.window
-    import kivy.uix.widget
+    import kivy.uix.widget  # noqa: F401
 
 
 def test_audiostream():
@@ -39,7 +39,7 @@ def test_numpy():
 
 
 def test_curly():
-    import curly
+    import curly  # noqa: F401
 
 
 def run_test(f, name):

tests/test_python3/main.py

@@ -1,7 +1,6 @@
 print("Python 3 running!")
 import sys
 print(f"sys.path: {sys.path}")
-import os
 import traceback
 
 modules_to_tests = [
@@ -21,17 +20,18 @@ for name in modules_to_tests:
 
 # test pyobjus
 print("- import pyobjus start")
-import pyobjus
+import pyobjus  # noqa: F401
 print("- import done")
 from pyobjus import autoclass
 NSNotificationCenter = autoclass("NSNotificationCenter")
 
 # test ios
-import ios
+import ios  # noqa: F401
 
 from kivy.app import App
 from kivy.lang import Builder
 
+
 class TestApp(App):
     def build(self):
         return Builder.load_string("""
@@ -51,4 +51,5 @@ RelativeLayout:
 
 """)
 
+
 TestApp().run()

tools/cythonize.py

@@ -7,6 +7,7 @@ import subprocess
 # resolve cython executable
 cython = None
 
+
 def resolve_cython():
     global cython
     for executable in ('cython', 'cython-2.7'):
@@ -17,6 +18,7 @@ def resolve_cython():
                 cython = os.path.join(path, executable)
                 return
 
+
 def do(fn):
     print('cythonize:', fn)
     assert(fn.endswith('.pyx'))
@@ -48,6 +50,7 @@ def do(fn):
         with open(fn_c, 'w') as fd:
             fd.write(data)
 
+
 if __name__ == '__main__':
     print('-- cythonize', sys.argv)
     resolve_cython()

tox.ini

@@ -13,6 +13,13 @@ deps = flake8
 commands = flake8 recipes/ tools/ tests/ .ci/ toolchain.py
 
 [flake8]
+exclude = tools/external/,
+          toolchain.py,  # Temporary removal: TODO: ZenCODE
+          recipes/kivy,  # Temporary removal: TODO: ZenCODE
+          recipes/python3,  # Temporary removal: TODO: ZenCODE
+          recipes/hostpython3,  # Temporary removal: TODO: ZenCODE
+          recipes/host_setuptools3,  # Temporary removal: TODO: ZenCODE
+
 ignore =
     E123,  # Closing bracket does not match indentation of opening bracket's line
     E124,  # Closing bracket does not match visual indentation