Remove unused enumerate() call (#357)

Author: ambv

python2/typing.py

@@ -618,7 +618,7 @@ def _subs_tree(cls, tvars=None, args=None):
     # ... then continue replacing down the origin chain.
     for ocls in orig_chain:
         new_tree_args = []
-        for i, arg in enumerate(ocls.__args__):
+        for arg in ocls.__args__:
             new_tree_args.append(_replace_arg(arg, ocls.__parameters__, tree_args))
         tree_args = new_tree_args
     return tree_args

src/typing.py

@@ -563,7 +563,7 @@ def _subs_tree(cls, tvars=None, args=None):
     # ... then continue replacing down the origin chain.
     for ocls in orig_chain:
         new_tree_args = []
-        for i, arg in enumerate(ocls.__args__):
+        for arg in ocls.__args__:
             new_tree_args.append(_replace_arg(arg, ocls.__parameters__, tree_args))
         tree_args = new_tree_args
     return tree_args

tox.ini

@@ -13,7 +13,6 @@ changedir = python2
 builtins = basestring, unicode
 ignore =
   # temporary ignores until we sort it out
-  B007,
   E128,
   E129,
   E501,