升级pip版本

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Error Reason:

WARNING: You are using pip version 20.0.2; however, version 20.3.3 is available.
You should consider upgrading via the 'c:\users\a1135\appdata\local\programs\python\python38\python.exe -m pip install --upgrade pip' command.

Solve Method:

#command
python -m pip install --upgrade pip

Analyze:

Maybe I installed 2 python visions(python2.7 (defalut) and python3.8)

Than I uninstall python2.7,because defalut ‘pip’ command base python2.7.

可能因为我安装了2个python版本，之后我卸载了python2.7.因为执行pip命令，默认升级的是python2.7的pip。

安装pip3

apt install python3-pip