pip的卸载、重装、升级（from pip19.3 to pip20.1）

问题起因

安装库失败，并且报错：You are using pip version 19.3.1; however, version 20.1.1 is available
pip需要升级，但搜索了网上现存的一些方法，未果。
在尝试卸载pip重装后发现easy_install命令失效后，经历波折，发现下面命令解决问题pip从19.3升级20.1比较方便：

问题解决：

①卸载PIP的命令：python -m pip uninstall pip
②重装PIP的命令：easy_inatall pip

//打开你的python目录输入
python -m ensurepip
//下方为完整反馈信息
D:\Python>python -m ensurepip
Looking in links: c:\Users\NaHS\AppData\Local\Temp\tmptzbt5nhe
Requirement already satisfied: setuptools in d:\python\lib\site-packages (42.0.2)
Collecting pip
Installing collected packages: pip
Successfully installed pip-19.2.3

③升级PIP的命令：python -m pip install --upgrade pip

//打开你的python目录输入
python -m pip install --upgrade pip
//下方为完整反馈信息
D:\Python>python -m pip install --upgrade pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/43/84/23ed6a1796480a6f1a2d38f2802901d078266bda38388954d01d3f2e821d/pip-20.1.1-py2.py3-none-any.whl (1.5MB)
     |████████████████████████████████| 1.5MB 10kB/s
Installing collected packages: pip
  Found existing installation: pip 19.2.3
    Uninstalling pip-19.2.3:
      Successfully uninstalled pip-19.2.3
Successfully installed pip-20.1.1

参考地址：https://www.cnblogs.com/burz/p/9099281.html

本文地址：https://blog.csdn.net/weixin_40289902/article/details/107646519