Merge #13718: docs: Specify preferred Python string formatting technique

b1b8863fd6 docs: Specify preferred Python string formatting technique (Mason Simon)

Pull request description:

  @practicalswift this documents the nit you suggested in my previous PR
  https://github.com/bitcoin/bitcoin/pull/13707#discussion_r203628395

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MarcoFalke 2018-07-20 09:03:17 -04:00
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@ -28,6 +28,7 @@ don't have test cases for.
- When subclassing the BitcoinTestFramwork, place overrides for the
`set_test_params()`, `add_options()` and `setup_xxxx()` methods at the top of
the subclass, then locally-defined helper methods, then the `run_test()` method.
- Use `'{}'.format(x)` for string formatting, not `'%s' % x`.
#### Naming guidelines