How to use the pyupgrade.Py2CompatibleVisitor function in pyupgrade
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asottile / pyupgrade / pyupgrade.py View on Github 
def _fix_py2_compatible(contents_text): # type: (str) -> str
try:
ast_obj = ast_parse(contents_text)
except SyntaxError:
return contents_text
visitor = Py2CompatibleVisitor()
visitor.visit(ast_obj)
if not any((
visitor.dicts,
visitor.sets,
visitor.set_empty_literals,
visitor.is_literal,
)):
return contents_text
try:
tokens = src_to_tokens(contents_text)
except tokenize.TokenError: # pragma: no cover (bpo-2180)
return contents_text
for i, token in reversed_enumerate(tokens):
if token.offset in visitor.dicts:
_process_dict_comp(tokens, i, visitor.dicts[token.offset])pyupgrade
A tool to automatically upgrade syntax for newer versions.
