[qa] Switch to py3

qa/rpc-tests/p2p-versionbits-warning.py

@@ -1,8 +1,7 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # Copyright (c) 2016 The Bitcoin Core developers
-# Distributed under the MIT/X11 software license, see the accompanying
+# Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-#
 
 from test_framework.mininode import *
 from test_framework.test_framework import BitcoinTestFramework
@@ -82,7 +81,7 @@ class VersionBitsWarningTest(BitcoinTestFramework):
         block_time = self.nodes[0].getblockheader(tip)["time"]+1
         tip = int(tip, 16)
 
-        for i in xrange(numblocks):
+        for i in range(numblocks):
             block = create_block(tip, create_coinbase(height+1), block_time)
             block.nVersion = nVersionToUse
             block.solve()