Minor Python cleanups to make flake8 pass with the new rules enabled

test/functional/wallet_txn_doublespend.py

@@ -27,7 +27,7 @@ class TxnMallTest(BitcoinTestFramework):
         for i in range(4):
             assert_equal(self.nodes[i].getbalance(), starting_balance)
             self.nodes[i].getnewaddress("")  # bug workaround, coins generated assigned to first getnewaddress!
-        
+
         # Assign coins to foo and bar accounts:
         node0_address_foo = self.nodes[0].getnewaddress("foo")
         fund_foo_txid = self.nodes[0].sendfrom("", node0_address_foo, 1219)
@@ -64,7 +64,7 @@ class TxnMallTest(BitcoinTestFramework):
         # Create two spends using 1 50 BTC coin each
         txid1 = self.nodes[0].sendfrom("foo", node1_address, 40, 0)
         txid2 = self.nodes[0].sendfrom("bar", node1_address, 20, 0)
-        
+
         # Have node0 mine a block:
         if (self.options.mine_block):
             self.nodes[0].generate(1)
@@ -76,7 +76,8 @@ class TxnMallTest(BitcoinTestFramework):
         # Node0's balance should be starting balance, plus 50BTC for another
         # matured block, minus 40, minus 20, and minus transaction fees:
         expected = starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"]
-        if self.options.mine_block: expected += 50
+        if self.options.mine_block:
+            expected += 50
         expected += tx1["amount"] + tx1["fee"]
         expected += tx2["amount"] + tx2["fee"]
         assert_equal(self.nodes[0].getbalance(), expected)
@@ -93,7 +94,7 @@ class TxnMallTest(BitcoinTestFramework):
         else:
             assert_equal(tx1["confirmations"], 0)
             assert_equal(tx2["confirmations"], 0)
-        
+
         # Now give doublespend and its parents to miner:
         self.nodes[2].sendrawtransaction(fund_foo_tx["hex"])
         self.nodes[2].sendrawtransaction(fund_bar_tx["hex"])