linux+ubuntu solve python

[ Download and install] (Download and install) undefined
[ Source code installation package](Source code installation package)Official website https://www.python.org/downloads/, I downloaded version 3.6 here
Download directly in the system

wget https://www.python.org/ftp/python/3.6.7/Python-3.6.7.tgz

tar -zxvf Python-3.6.7.tgz

cd Python-3.6.7/ ./configure prefix=/usr/local/python36 make && make instal

Since I have a python3 version before, I need to replace it. Directly establish a soft link without replacement.
Find python3 location

which python3
Result: /usr/bin/python3

mv /usr/bin/python3 /usr/bin/python3.bak

ln -s /usr/local/python36/bin/python3 /usr/local/bin/

ln -s /usr/local/python36/bin/pip /usr/local/bin/pip3
Execute pip3 -V and you can see that it points to python3, success!

Here is a problem. For example, we often use virtualenv in our projects. Every time you execute virtualenv --no-site-packages venv, it will point to a certain python version, depending on the last installation you installed. You can go directly to the directory and execute: eg:/usr/local/python36/bin/virtualenv

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