For unused variables reported by pyflakes, either remove the variable,

suppress the warning, or fix a bug (if the wrong variable was used).
refs #2450

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

qa/rpc-tests/receivedby.py

@@ -14,7 +14,6 @@ def get_sub_array_from_array(object_array, to_match):
         Finds and returns a sub array from an array of arrays.
         to_match should be a unique idetifier of a sub array
     '''
-    num_matched = 0
     for item in object_array:
         all_match = True
         for key,value in to_match.items():
@@ -120,7 +119,7 @@ class ReceivedByTest(BitcoinTestFramework):
         received_by_account_json = get_sub_array_from_array(self.nodes[1].listreceivedbyaccount(),{"account":account})
         if len(received_by_account_json) == 0:
             raise AssertionError("No accounts found in node")
-        balance_by_account = rec_by_accountArr = self.nodes[1].getreceivedbyaccount(account)
+        balance_by_account = self.nodes[1].getreceivedbyaccount(account)
 
         txid = self.nodes[0].sendtoaddress(addr, 0.1)
         self.sync_all()