Ubuntu pip版本的安装，卸载，查看，更新

pip版本的安装：

sudo apt-get install python3-pip

pip版本的查看：

pip3 --version


pip3 -V

pip更新：

sudo pip3 install --upgrade pip

pip卸载：

sudo apt-get remove python3-pip

pip3安装过后在查看版本的时候会出现这个问题

1 Original exception was:
2 Traceback (most recent call last):
3   File "/usr/bin/pip3", line 9, in <module>
4     from pip import main
5 ImportError: cannot import name 'main'

执行下面命令改变里面的文件即可

sudo vi /usr/bin/pip3

 1 #!/usr/bin/python3
 2 # GENERATED BY DEBIAN
 3
 4 import sys
 5
 6 # Run the main entry point, similarly to how setuptools does it, but because
 7 # we didn't install the actual entry point from setup.py, don't use the
 8 # pkg_resources API.
 9 from pip import __main__
10 if __name__ == '__main__':
11     sys.exit(__main__._main())