ubuntu18.04 install python2
Ubuntu 18.04 is installed by default with python3.6
[ Install python2.7:](install python2.7:)
[ sudo apt install python2.7](sudo apt install python2.7)undefined
[ Successful installation:]( Successful installation:) undefined
[ Install pip and pip3](install pip and pip3)
[ Installation command:](Installation command:)[sudo apt install python-pip](sudo apt install python-pip)[sudo apt install python-pip3](sudo apt install python-pip3)undefined
[ After the installation is successful, we want to use the related python instructions, and the following situation appears: (pip similar)] (After the installation is successful, we want to use the related python instructions, and the following situation appears: (pip Similar)) undefined
[ Now check the storage path of the bin file of python2.7 python3.6 pip pip3] (Check the storage path of the bin file of python2.7 python3.6 pip pip3 now) undefined
[ Use alias to set alias, version coexistence and switch] (use alias to set alias, version coexistence and switch)
[ After stepping on the pit, the following code is not recommended] (after stepping on the pit, the following code is not recommended)
[ Operating instruction: gedit ~/.bashrc] (Operating instruction: gedit ~/.bashrc)
alias pip=/usr/bin/pip
alias pip3=/usr/bin/pip3
alias python=/usr/bin/python2.7
alias python3=/usr/bin/python3.6
[ After configuration is as follows:](After configuration is as follows:) undefined
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