Make pythonisms consistent

qa/rpc-tests/bip65-cltv-p2p.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import ComparisonTestFramework
 from test_framework.util import start_nodes
 from test_framework.mininode import CTransaction, NetworkThread

qa/rpc-tests/bipdersig-p2p.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import ComparisonTestFramework
 from test_framework.util import start_nodes
 from test_framework.mininode import CTransaction, NetworkThread

qa/rpc-tests/blockchain.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -8,6 +8,8 @@
 # rpc/blockchain.cpp.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 import decimal
 
 from test_framework.test_framework import BitcoinTestFramework

qa/rpc-tests/decodescript.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_nodes

qa/rpc-tests/disablewallet.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Exercise API with -disablewallet.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import initialize_chain_clean, start_nodes
 

qa/rpc-tests/finalsaplingroot.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,

qa/rpc-tests/forknotify.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test -alertnotify 
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import start_node, connect_nodes
 

qa/rpc-tests/fundrawtransaction.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, assert_greater_than, \

qa/rpc-tests/getblocktemplate.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2016 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, connect_nodes_bi, \
     initialize_chain_clean, start_nodes

qa/rpc-tests/getblocktemplate_longpoll.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import AuthServiceProxy
 from test_framework.util import random_transaction

qa/rpc-tests/getblocktemplate_proposals.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 

qa/rpc-tests/getchaintips.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # on chains of different lengths, and join the network together again.
 # This gives us two tips, verify that it works.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal
 

qa/rpc-tests/hardforkdetection.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 #
 # Test hard fork detection
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, start_node

qa/rpc-tests/httpbasics.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test rpc http basics
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, start_nodes
 

qa/rpc-tests/invalidateblock.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test InvalidateBlock code
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import initialize_chain_clean, start_node, \
     connect_nodes_bi, sync_blocks

qa/rpc-tests/invalidblockrequest.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import ComparisonTestFramework
 from test_framework.util import assert_equal
 from test_framework.comptool import TestManager, TestInstance

qa/rpc-tests/key_import_export.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from decimal import Decimal
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_greater_than, start_nodes, initialize_chain_clean, connect_nodes_bi

qa/rpc-tests/keypool.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 
 # Add python-bitcoinrpc to module search path:
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import check_json_precision, initialize_chain, \
     start_nodes, start_node, stop_nodes, wait_bitcoinds, bitcoind_processes

qa/rpc-tests/listtransactions.py

@@ -1,10 +1,12 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 # Exercise the listtransactions API
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 
 from decimal import Decimal

qa/rpc-tests/maxblocksinflight.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.mininode import NodeConn, NodeConnCB, NetworkThread, \
     EarlyDisconnectError, CInv, msg_inv, mininode_lock
 from test_framework.test_framework import BitcoinTestFramework

qa/rpc-tests/mempool_nu_activation.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_node, connect_nodes, wait_and_assert_operationid_status

qa/rpc-tests/mempool_reorg.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -8,6 +8,8 @@
 # that spend (directly or indirectly) coinbase transactions.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, assert_raises, start_node, connect_nodes

qa/rpc-tests/mempool_resurrect_test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -8,6 +8,8 @@
 # the blockchain is re-organized.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, start_node
 

qa/rpc-tests/mempool_spendcoinbase.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -13,6 +13,8 @@
 # but less mature coinbase spends are NOT.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, assert_greater_than, assert_raises, \

qa/rpc-tests/mempool_tx_expiry.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test proper expiry for transactions >= version 3
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.authproxy import JSONRPCException
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, \

qa/rpc-tests/mempool_tx_input_limit.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/mergetoaddress_sapling.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from mergetoaddress_helper import MergeToAddressHelper
 

qa/rpc-tests/mergetoaddress_sprout.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from mergetoaddress_helper import MergeToAddressHelper
 

qa/rpc-tests/merkle_blocks.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test merkleblock fetch/validation
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 import string
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException

qa/rpc-tests/nodehandling.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test node handling
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, connect_nodes_bi, p2p_port
 

qa/rpc-tests/p2p-acceptblock.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.mininode import CBlockHeader, CInv, NodeConn, NodeConnCB, \
     NetworkThread, msg_block, msg_headers, msg_inv, msg_ping, msg_pong, \
     mininode_lock

qa/rpc-tests/p2p_node_bloom.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.mininode import NodeConn, NodeConnCB, NetworkThread, \
     msg_filteradd, msg_filterclear, mininode_lock, SPROUT_PROTO_VERSION
 from test_framework.test_framework import BitcoinTestFramework

qa/rpc-tests/p2p_nu_peer_management.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.mininode import (
     NodeConn,
     NodeConnCB,

qa/rpc-tests/p2p_txexpiringsoon.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.authproxy import JSONRPCException
 from test_framework.mininode import NodeConn, NodeConnCB, NetworkThread, \
     CTransaction, CInv, msg_mempool, msg_getdata, msg_tx, mininode_lock, \

qa/rpc-tests/p2p_txexpiry_dos.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.mininode import NodeConn, NodeConnCB, NetworkThread, \
     CTransaction, msg_tx, mininode_lock, OVERWINTER_PROTO_VERSION
 from test_framework.test_framework import BitcoinTestFramework

qa/rpc-tests/paymentdisclosure.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/prioritisetransaction.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_node, connect_nodes

qa/rpc-tests/proton_test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -13,6 +13,8 @@
 #     pip install python-qpid-proton
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, bytes_to_hex_str, \
     start_nodes

qa/rpc-tests/proxy_test.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.socks5 import Socks5Configuration, Socks5Command, Socks5Server, AddressType
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, start_nodes

qa/rpc-tests/pruning.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -11,6 +11,8 @@
 # This test takes 30 mins or more (up to 2 hours)
 # ********
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import initialize_chain_clean, start_node, \

qa/rpc-tests/rawtransactions.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -8,6 +8,8 @@
 # that spend (directly or indirectly) coinbase transactions.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/receivedby.py

@@ -1,10 +1,12 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 # Exercise the listreceivedbyaddress API
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 
 from decimal import Decimal

qa/rpc-tests/regtest_signrawtransaction.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import start_nodes, wait_and_assert_operationid_status
 

qa/rpc-tests/reindex.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test -reindex with CheckBlockIndex
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_node, stop_node, wait_bitcoinds

qa/rpc-tests/reorg_limit.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test reorg limit
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     check_node,

qa/rpc-tests/rest.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test REST interface
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_greater_than, \
     initialize_chain_clean, start_nodes, connect_nodes_bi

qa/rpc-tests/rewind_index.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_nodes, start_node, connect_nodes_bi, bitcoind_processes

qa/rpc-tests/rpcbind_test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 
 # Dependency: python-bitcoinrpc
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.util import assert_equal, check_json_precision, \
     initialize_chain, start_nodes, stop_nodes, wait_bitcoinds, \
     bitcoind_processes, rpc_port

qa/rpc-tests/script_test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -19,6 +19,8 @@ that flag, we use a block time before the switchover date).
 NOTE: This test is very slow and may take more than 40 minutes to run.
 '''
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import ComparisonTestFramework
 from test_framework.comptool import TestInstance, TestManager
 from test_framework.mininode import NetworkThread

qa/rpc-tests/signrawtransaction_offline.py

@@ -1,4 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
+
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_true, initialize_chain_clean, start_node

qa/rpc-tests/signrawtransactions.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_nodes

qa/rpc-tests/smartfees.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014-2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test fee estimation code
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import start_node, connect_nodes, \
     sync_blocks, sync_mempools

qa/rpc-tests/txn_doublespend.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test proper accounting with malleable transactions
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, connect_nodes, \
     sync_blocks, gather_inputs

qa/rpc-tests/wallet.py

@@ -1,8 +1,9 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException

qa/rpc-tests/wallet_1941.py

@@ -1,10 +1,12 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2016 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 # This is a regression test for #1941.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     initialize_datadir, start_nodes, start_node, connect_nodes_bi, \

qa/rpc-tests/wallet_addresses.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, start_nodes
 

qa/rpc-tests/wallet_anchorfork.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_nodes, stop_nodes, connect_nodes_bi, \

qa/rpc-tests/wallet_changeindicator.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_true, assert_false, wait_and_assert_operationid_status
 

qa/rpc-tests/wallet_import_export.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_true, start_nodes
 

qa/rpc-tests/wallet_listnotes.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, start_nodes, wait_and_assert_operationid_status
 

qa/rpc-tests/wallet_listreceived.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_true, assert_false
 from test_framework.util import start_nodes, wait_and_assert_operationid_status

qa/rpc-tests/wallet_mergetoaddress.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/wallet_nullifiers.py

@@ -1,8 +1,9 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2016 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_true, bitcoind_processes, \

qa/rpc-tests/wallet_overwintertx.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_nodes, connect_nodes_bi, wait_and_assert_operationid_status

qa/rpc-tests/wallet_persistence.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal, assert_true,

qa/rpc-tests/wallet_protectcoinbase.py

@@ -1,8 +1,9 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2016 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException

qa/rpc-tests/wallet_sapling.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2018 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import (

qa/rpc-tests/wallet_shieldcoinbase.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/wallet_shieldcoinbase_sapling.py

@@ -1,4 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 import inspect
 import os
 

qa/rpc-tests/wallet_shieldcoinbase_sprout.py

@@ -1,4 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 import inspect
 import os
 

qa/rpc-tests/wallet_treestate.py

@@ -1,8 +1,9 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2016 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/walletbackup.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -33,6 +33,8 @@ Shutdown again, restore using importwallet,
 and confirm again balances are correct.
 """
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/zapwallettxes.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2014 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \

qa/rpc-tests/zcjoinsplit.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 #
 # Test joinsplit semantics
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, start_node, \
     gather_inputs

qa/rpc-tests/zcjoinsplitdoublespend.py

@@ -1,9 +1,11 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 #
 # Tests a joinsplit double-spend and a subsequent reorg.
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, connect_nodes, \

qa/rpc-tests/zkey_import_export.py

@@ -1,8 +1,10 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from decimal import Decimal
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_greater_than, start_nodes,\

qa/rpc-tests/zmq_test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -7,6 +7,8 @@
 # Test ZMQ interface
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, bytes_to_hex_str, start_nodes
 

qa/zcash/create_wallet_200k_utxos.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 # Copyright (c) 2017 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -13,6 +13,8 @@
 # - Archive the resulting /tmp/test###### directory
 #
 
+import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
+
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,