为何python文档要前加 # coding=utf-8

由于若是不加编码方式，在python文档中加中文注释的时候，会有下列报错python File "encode.py", line 5 SyntaxError: Non-ASCII character '\xe7' in file encode.py on line 1, but no encoding declared; see //..python.../dev/peps/pep-0263/

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