pycharm replace pip mirror source for domestic, to solve the problem of slow download

Reference link: https: //www.cnblogs.com/hkgov/p/7799078.html

Official sources download speed is too slow, will soon be replaced by domestic sources.

Recommended Tsinghua source: https: //pypi.tuna.tsinghua.edu.cn/simple

1, first open the Settings page

2, Open Source Manager

3, the input source of Tsinghua

4. Finally, official sources deleted

spare.