python Douban replaces pip to install python module

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Use `pip3 freeze -> requirements.txt` command to migrate module under python##

Function introduction: Pack the module name and version of python that has been installed on your computer for easy transplantation.
Open cmd and run: pip3 freeze -> requirements.txt will generate requirements.txt file
Open cmd and run: pip3 install -r requirements.txt to install all the modules in the requirements.txt file

Python pip installation speed is slow, and there is always timeout failure##

Solution:
Recommend Douban download pip3 install -i https://pypi.doubanio.com/simple/

pip3 install -i https://pypi.doubanio.com/simple/Package names

For example: pip3 install -i https://pypi.doubanio.com/simple/ -r requirements.txt

pip3 install -i https://pypi.doubanio.com/simple/ module name

**For example, install the numpy module: **

pip3 install -i https://pypi.doubanio.com/simple/ numpy

python Douban replaces pip to install python module

Use pip3 freeze -&gt; requirements.txt command to migrate module under python##

Python pip installation speed is slow, and there is always timeout failure##

Use `pip3 freeze -> requirements.txt` command to migrate module under python##