python2 python3 转换，兼容

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1.参考

https://docs.python.org/3/library/urllib.html

urllib is a package that collects several modules for working with URLs:

• urllib.request for opening and reading URLs
• urllib.error containing the exceptions raised by urllib.request
• urllib.parse for parsing URLs
• urllib.robotparser for parsing robots.txt files

HOWTO Fetch Internet Resources Using The urllib Package

Python同时兼容python2和python3的8个技巧分享

D:\Python36\Tools\scripts>python3 2to3.py "G:\xxx.py"

仅输出变化，加 -w 则备份和生成替换文件

https://pythonhosted.org/six/

https://docs.python.org/3/howto/pyporting.html  Porting Python 2 Code to Python 3

google：urllib compatible python3

Cheat Sheet: Writing Python 2-3 compatible code

Supporting Python 2 and 3 without 2to3 conversion

Targeting python 2 and 3 at the same time.

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