问题：

安装pymysql时报错

Requirement already satisfied: pymysql in c:\python27\lib\site-packages (0.9.2)
Requirement already satisfied: cryptography in c:\python27\lib\site-packages (fr
om pymysql) (2.3.1)

 

 

解决办法：

复制报错路径，加--target=路径  pymysql 再次安装即可

C:\Users\lenovo>pip.exe install --target=c:\python27\lib\site-packages pymysql
Collecting pymysql