古董python2.7，最近又写了几个程序，需要用到pymysql 连接MySQL数据库，但是一直出现一个警告提示，看着烦。
/usr/lib/python2.7/site-packages/PyInstaller/loader/pyimod03_importers.py:395: CryptographyDeprecationWarning: Python 2 is no longer supported by the Python core team. Support for it is now deprecated in cryptography, and will be removed in the next release.
意思是将在未来版本不支持Python 2，但是我这生产环境，又不能升级。
网上说安装低版本的cryptography，比如
pip install cryptography==2.6 但是我这里好像没找到2.6的版本。
看到另一个直接修改代码，把警告去掉。
修改 /usr/lib64/python2.7/site-packages/cryptography/__init__.py
在最后面把版本判断注释掉
#if sys.version_info[0] == 2: # warnings.warn( # "Python 2 is no longer supported by the Python core team. Support for " # "it is now deprecated in cryptography, and will be removed in the " # "next release.", # CryptographyDeprecationWarning, # stacklevel=2, # )
Windows 路径 C:\python2.7\Lib\site-packages\cryptography\__init__.py
根据自己安装的路径修改。
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