diff --git a/lbry/wallet/server/block_processor.py b/lbry/wallet/server/block_processor.py
index 8558afe5c..4391736d0 100644
--- a/lbry/wallet/server/block_processor.py
+++ b/lbry/wallet/server/block_processor.py
@@ -605,8 +605,7 @@ class BlockProcessor:
         # Key: b'h' + compressed_tx_hash + tx_idx + tx_num
         # Value: hashX
         prefix = b'h' + tx_hash[:4] + idx_packed
-        candidates = {db_key: hashX for db_key, hashX
-                      in self.db.utxo_db.iterator(prefix=prefix)}
+        candidates = dict(self.db.utxo_db.iterator(prefix=prefix))
         for hdb_key, hashX in candidates.items():
             tx_num_packed = hdb_key[-4:]
             if len(candidates) > 1:
diff --git a/lbry/wallet/server/leveldb.py b/lbry/wallet/server/leveldb.py
index 7c023ee2e..5498706bd 100644
--- a/lbry/wallet/server/leveldb.py
+++ b/lbry/wallet/server/leveldb.py
@@ -137,9 +137,7 @@ class LevelDB:
             return
 
         def get_headers():
-            return [
-                header for header in self.headers_db.iterator(prefix=HEADER_PREFIX, include_key=False)
-            ]
+            return list(self.headers_db.iterator(prefix=HEADER_PREFIX, include_key=False))
 
         headers = await asyncio.get_event_loop().run_in_executor(self.executor, get_headers)
         assert len(headers) - 1 == self.db_height, f"{len(headers)} vs {self.db_height}"
diff --git a/lbry/wallet/server/mempool.py b/lbry/wallet/server/mempool.py
index ce08f7446..276fcf66c 100644
--- a/lbry/wallet/server/mempool.py
+++ b/lbry/wallet/server/mempool.py
@@ -324,7 +324,7 @@ class MemPool:
                          for prevout in tx.prevouts
                          if prevout[0] not in all_hashes)
         utxos = await self.api.lookup_utxos(prevouts)
-        utxo_map = {prevout: utxo for prevout, utxo in zip(prevouts, utxos)}
+        utxo_map = dict(zip(prevouts, utxos))
 
         return self._accept_transactions(tx_map, utxo_map, touched)