关于python 安装MySQL库引出的一些问题 2018-07

1、首先是想到用pip来安装pymysql

pip install mysql

报错：

cryptography requires setuptools 18.5 or newer, please upgrade to a

2、我想到的是更新pip

sudo pip install --upgrade pip

其实需要更新的是setuptools:

sudo pip install -t /usr/local/lib/python3.6/site-packages/ setuptools

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:

sudo pip install pymysql

安装到python3.4:

sudo pip install -t /usr/local/lib/python3.4/site-packages/ pymysql

安装到python3.6:

sudo pip install -t /usr/local/lib/python3.6/site-packages/ pymysql

安装到虚拟环境中：

sudo pip install -t ~/Pycharm/py36env/lib/python3.6/site-packages pymysql

报错：

 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

解决方式：

sudo pip --trusted-host pypi.python.org install -t ~/PycharmProjects/py36env/lib/python3.6/site-packages/ mysql

问题解决。