linux多python版本安装和切换

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sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python2.7
sudo apt install python3.5
sudo apt install python3.6
sudo apt install python3.7
sudo apt install python3.8
sudo apt install python3.9

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sudo nano ~/.bashrc
# 输入
alias python=‘/usr/bin/python3.7’
# 保存退出

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sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.5 2
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 3
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 4
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 5
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.9 6

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sudo update-alternatives --config python

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curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python3.x get-pip.py