tests: fix style in tools/signtest.py

.flake8

@@ -3,11 +3,12 @@ exclude =
     .tox/,
     build/,
     dist/,
-    tools/signtest.py,
     trezorlib/*_pb2.py
 ignore =
     # F821 undefined name 'unicode',
     F821,
+    # F841 local variable is assigned to but never used
+    F841,
     # F401: module imported but unused
     F401,
     # E402: module level import not at top of file

tools/signtest.py

@@ -16,17 +16,20 @@ from trezorlib.tx_api import TxApiBitcoin
 from trezorlib.transport_hid import HidTransport
 from trezorlib.transport_bridge import BridgeTransport
 
+
 def hash160(x):
     h = hashlib.new("ripemd160")
     h.update(hashlib.sha256(x).digest())
     return h.digest()
 
+
 def pack_varint(x):
     if (x < 0xfd):
         return chr(x)
     else:
         return '\xfd' + chr(x & 0xff) + chr((x >> 8) & 0xff)
 
+
 def int_to_string(x, pad):
     result = ['\x00'] * pad
     while x > 0:
@@ -36,6 +39,7 @@ def int_to_string(x, pad):
         x >>= 8
     return ''.join(result)
 
+
 def string_to_int(s):
     result = 0
     for c in s:
@@ -44,6 +48,7 @@ def string_to_int(s):
         result = (result << 8) + c
     return result
 
+
 class MyTxApiBitcoin(object):
 
     def set_publickey(self, node):
@@ -68,7 +73,6 @@ class MyTxApiBitcoin(object):
         ser = ser + int_to_string(tx.lock_time, 4)[::-1]
         return ser
 
-
     def create_inputs(self, numinputs, txsize):
         idx = 0
         sum = 0
@@ -83,7 +87,7 @@ class MyTxApiBitcoin(object):
             i.prev_index = random.randint(0, 4)
             i.script_sig = os.urandom(100)
             i.sequence = 0xffffffff
-            if (nr % 50 == 0):
+            if nr % 50 == 0:
                 print(nr)
             myout = random.randint(0, txsize - 1)
             segwit = random.randint(0, 2)
@@ -100,10 +104,10 @@ class MyTxApiBitcoin(object):
                     pubkey = tools.hash_160(node.public_key)
                 else:
                     pubkey = os.urandom(20)
-                if (segwit == 2):
+                if segwit == 2:
                     # p2sh segwit
                     o.script_pubkey = b'\xa9\x14' + hash160(b'\x00\x14' + pubkey) + b'\x87'
-                elif (segwit == 1):
+                elif segwit == 1:
                     o.script_pubkey = b'\x00\x14' + pubkey
                 else:
                     o.script_pubkey = b'\x76\xa9\x14' + pubkey + b'\x88\xac'
@@ -112,10 +116,12 @@ class MyTxApiBitcoin(object):
             txhash = tools.Hash(txser)[::-1]
             outi = self.inputs.append(
                 proto_types.TxInputType(
-                    address_n=self.client.expand_path("44'/0'/0'/0/"+str(idx)),
-                    script_type = (proto_types.SPENDWITNESS if segwit == 1 else
+                    address_n=self.client.expand_path("44'/0'/0'/0/%d" % idx),
+                    script_type=(
+                        proto_types.SPENDWITNESS if segwit == 1 else
                         proto_types.SPENDP2SHWITNESS if segwit == 2 else
-                                   proto_types.SPENDADDRESS),
+                        proto_types.SPENDADDRESS
+                    ),
                     prev_hash=txhash,
                     prev_index=myout,
                     amount=amount if segwit > 0 else 0
@@ -142,6 +148,7 @@ class MyTxApiBitcoin(object):
         # print(t)
         return t
 
+
 def main():
     numinputs = 100
     sizeinputtx = 10
@@ -211,7 +218,7 @@ def main():
         # script_type=proto_types.PAYTOADDRESS,
         # # address_n=client.expand_path("44'/0'/0'/0/18"),
         # # address='1PtCkQgyN6xHmXWzLmFFrDNA5vYhYLeNFZ',
-#             address='1NcMqUvyWv1K3Zxwmx5sqfj7ZEmPCSdJFM',
+        # # address='1NcMqUvyWv1K3Zxwmx5sqfj7ZEmPCSdJFM',
         # ),
     ]
 
@@ -221,5 +228,6 @@ def main():
 
     client.close()
 
+
 if __name__ == '__main__':
     main()