How to use the pyupgrade.FindSimpleFormats function in pyupgrade
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asottile / pyupgrade / pyupgrade.py View on Github 
def _fix_fstrings(contents_text): # type: (str) -> str
try:
ast_obj = ast_parse(contents_text)
except SyntaxError:
return contents_text
visitor = FindSimpleFormats()
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
if _is_bytestring(token.src): # pragma: no cover (py2-only)
continuepyupgrade
A tool to automatically upgrade syntax for newer versions.
