Fix pyflakes warnings in RPC tests

qa/rpc-tests/key_import_export.py

@@ -3,10 +3,9 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-from time import sleep
 from decimal import Decimal
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, assert_greater_than, sync_blocks, start_nodes, initialize_chain_clean, connect_nodes_bi
+from test_framework.util import assert_equal, assert_greater_than, start_nodes, initialize_chain_clean, connect_nodes_bi
 
 import logging
 
@@ -32,7 +31,7 @@ class KeyImportExportTest (BitcoinTestFramework):
         [alice, bob, charlie, miner] = self.nodes
 
         def alice_to_bob(amount):
-            txid = alice.sendtoaddress(addr, Decimal(amount))
+            alice.sendtoaddress(addr, Decimal(amount))
             self.sync_all()
             miner.generate(1)
             self.sync_all()

qa/rpc-tests/wallet_shieldcoinbase.py

@@ -8,7 +8,6 @@ from test_framework.authproxy import JSONRPCException
 from test_framework.util import assert_equal, initialize_chain_clean, \
     start_node, connect_nodes_bi, sync_blocks
 
-import sys
 import time
 from decimal import Decimal
 
@@ -117,7 +116,7 @@ class WalletShieldCoinbaseTest (BitcoinTestFramework):
 
         # Shield coinbase utxos from node 0 of value 40, standard fee of 0.00010000
         result = self.nodes[0].z_shieldcoinbase(mytaddr, myzaddr)
-        mytxid = self.wait_and_assert_operationid_status(0, result['opid'])
+        self.wait_and_assert_operationid_status(0, result['opid'])
         self.sync_all()
         self.nodes[1].generate(1)
         self.sync_all()
@@ -131,7 +130,7 @@ class WalletShieldCoinbaseTest (BitcoinTestFramework):
 
         # Shield coinbase utxos from any node 2 taddr, and set fee to 0
         result = self.nodes[2].z_shieldcoinbase("*", myzaddr, 0)
-        mytxid = self.wait_and_assert_operationid_status(2, result['opid'])
+        self.wait_and_assert_operationid_status(2, result['opid'])
         self.sync_all()
         self.nodes[1].generate(1)
         self.sync_all()
@@ -181,7 +180,7 @@ class WalletShieldCoinbaseTest (BitcoinTestFramework):
         result = self.nodes[2].z_shieldcoinbase(mytaddr, myzaddr, 0)
         assert_equal(result["shieldingUTXOs"], Decimal('7'))
         assert_equal(result["remainingUTXOs"], Decimal('13'))
-        mytxid = self.wait_and_assert_operationid_status(2, result['opid'])
+        self.wait_and_assert_operationid_status(2, result['opid'])
         self.sync_all()
         self.nodes[1].generate(1)
         self.sync_all()