When using Python need to install the various modules, and pip is very powerful module installation tool, but often because foreign official pypi wall, resulting in unusable, so we had better be the pip source they use to replace it, so wall solve the cause of trouble is not installed on the library.
1, domestic mirror source
NetEase: http://mirrors.163.com/
Ali: https://opsx.alibaba.com/mirror
Tsinghua: https://mirrors.tuna.tsinghua.edu.cn/
USTC: http://mirrors.ustc.edu.cn/
wait wait wait. . . .
I am more accustomed to using the pip source of Tsinghua University, which is the official network pypi mirroring, synchronization once every 5 minutes
2, change the pip mirror source to domestic mirror source
A, Temporary Use:
You can add parameters -i https://pypi.tuna.tsinghua.edu.cn/simple when using the pip
For example: pip install -i https://pypi.tuna.tsinghua.edu.cn/simple gevent, this will go from the image side of the mounting Tsinghua gevent library.
B, permanent changes:
Under Linux, modify ~ / .pip / pip.conf (not create one), to modify the index-url Tuna, as follows:
[global] index-url = https://pypi.tuna.tsinghua.edu.cn/simpleUnder windows, create a directory pip directly in the user directory, such as: C: \ Users \ xx \ pip, the new file pip.ini, reads as follows
[global] index-url = https://pypi.tuna.tsinghua.edu.cn/simple 
3. Verification:
win + r enter "cmd" window open command input pip install X verification. We can see the source image has changed.
OKK !!
：）