python 2.7版本解决TypeError: ‘encoding‘ is an invalid keyword argument for this function

with open(file_name, "a", encoding="utf-8") as f:

with open(file_name, "a", encoding="utf-8") as f:

TypeError: 'encoding' is an invalid keyword argument for this function

解决办法：

import io with io.open(file_name, "a", encoding="utf-8") as f: