1、首先用pip来安装pymysql
报错：
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cryptography requires setuptools 18.5 or newer, please upgrade to a new version
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2、我想到的是更新pip
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sudo pip install --upgrade pip
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其实需要更新的是setuptools:
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sudo pip install -t /usr/local/lib/python3.6/site-packages/ setuptools
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3、使用pip将pymysql安装到想要的地方
针对多python版本的情况：
安装到python2.7:
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sudo pip install pymysql
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安装到python3.4:
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sudo pip install -t /usr/local/lib/python3.4/site-packages/ pymysql
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安装到python3.6:
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sudo pip install -t /usr/local/lib/python3.6/site-packages/ pymysql
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安装到虚拟环境中：
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sudo pip install -t ~/Pycharm/py36env/lib/python3.6/site-packages pymysql
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报错：
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Could not fetch URL https://pypi.python.org/simple/requests/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available. - skipping
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解决方式：
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sudo pip --trusted-host pypi.python.org install -t ~/PycharmProjects/py36env/lib/python3.6/site-packages/ mysql
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问题解决。
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