记：直接下载https://pypi.org/project/pip/#files tar 解压后执行
python setup.py install
提示权限错误，
[Errno 13] Permission denied: 'C:\\Program Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.8_3.8.752.0_x64__qbz5n2kfra8p0\\Lib\\site-packages\\test-easy-install-8476.write-test'
换个方法
浏览器中输入网址：https://bootstrap.pypa.io/get-pip.py转到进行下载，另存文件保存到本地电脑中 e:
cmd
e:
python get-pip.py
python -m pip --version
按提示升级
C:\Users\Administrator\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip
===安装记录＝＝＝
WARNING: You are using pip version 19.2.3; however, version 20.1 is available.
You should consider upgrading via the 'C:\Users\Administrator\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip' command.
PS E:\python> python -m pip --version
pip 20.1 from C:\Users\Administrator\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\pip (python 3.8)
PS E:\python> C:\Users\Administrator\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip
Requirement already up-to-date: pip in d:\wpsystem\s-1-5-21-1165689972-3347676493-3846110041-500\appdata\local\packages\pythonsoftwarefoundation.python.3.8_qbz5n2kfra8p0\localcache\local-packages\python38\site-packages (20.1)
PS E:\python> python -m pip --version
pip 20.1 from C:\Users\Administrator\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\pip (python 3.8)
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from: https://jingyan.baidu.com/article/647f0115f45f4c7f2148a8b8.html
