paytest: fix flake8 code nits

paytest/paytest.py

@@ -193,10 +193,10 @@ def testinvoice(destination, amount=None, **kwargs):
 
 def wrap_error(keys, err):
     b = unhexlify(err)
-    l = len(b)
-    padlen = 256 - l
+    c = len(b)
+    padlen = 256 - c
     pad = b"\x00" * padlen
-    b = struct.pack("!H", l) + b + struct.pack("!H", padlen) + pad
+    b = struct.pack("!H", c) + b + struct.pack("!H", padlen) + pad
     assert len(b) == 256 + 2 + 2
     h = hmac.HMAC(keys.um, hashes.SHA256(), backend=default_backend())
     h.update(b)
@@ -280,7 +280,7 @@ def on_htlc_accepted(onion, htlc, request, plugin, *args, **kwargs):
         Timer(60.0, timeout, args=(plugin, ps)).start()
 
     payment_data = payload.get(8).value
-    secret = payment_data[:32]
+    # secret = payment_data[:32]
     total = payment_data[32:].hex()
 
     total = int(total, 16)

paytest/test_paytest.py

@@ -1,8 +1,6 @@
 from pyln.testing.fixtures import *  # noqa: F401,F403
-from pyln.testing.utils import DEVELOPER
 from pyln.client import RpcError
 import os
-import unittest
 import pytest
 from pprint import pprint
 
@@ -17,7 +15,7 @@ def test_start(node_factory):
 
 def test_invoice(node_factory):
     l1 = node_factory.get_node(options=pluginopt)
-    inv = l1.rpc.testinvoice('03'*33)
+    inv = l1.rpc.testinvoice('03' * 33)
     details = l1.rpc.decodepay(inv['invoice'])
     pprint(details)
 
@@ -41,7 +39,7 @@ def test_mpp_pay(node_factory):
     """ l1 send a payment that is going to be split.
     """
     l1, l2 = node_factory.line_graph(2, opts=pluginopt, wait_for_announce=True)
-    res = l1.rpc.paytest(l2.info['id'], 2*10**8)
+    res = l1.rpc.paytest(l2.info['id'], 2 * 10**8)
 
     l2.daemon.wait_for_log(r'Received 200000000/200000000 with [0-9]+ parts')