How to use the pyupgrade.FindPercentFormats function in pyupgrade
To help you get started, we’ve selected a few pyupgrade examples, based on popular ways it is used in public projects.
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asottile / pyupgrade / pyupgrade.py View on Github 
def _fix_percent_format(contents_text): # type: (str) -> str
try:
ast_obj = ast_parse(contents_text)
except SyntaxError:
return contents_text
visitor = FindPercentFormats()
visitor.visit(ast_obj)
if not visitor.found:
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):
node = visitor.found.get(token.offset)
if node is None:
continue
# no .format() equivalent for bytestrings in py3pyupgrade
A tool to automatically upgrade syntax for newer versions.
