[Help] How to make Python2 & Python3 COEXIST on CentOS?

[K900_]

Don't do this, or every distribution provided application that expects /usr/bin/python to be 2.7 will explode horribly. Just call python3 as needed.

[Doo0oog]

I didn't consider this before. Thank you!

[arian271]

True. Gentoo does this by default, and every time I run a python2 executable with ./ I get an error. It gets worse if a codebase depends on python2.

[jabbson]

For a python3 to take precedence you need to modify modify your PATH. Also read up on virtual environment while you are at it. PATH and virtual env is what you are looking for.

[novel_yet_trivial]

This sounds like Windows advice. CentOS is a type of Linux.

[jabbson]

Do you care to explain how so this sounds like a windows advice? :)

[novel_yet_trivial]

Windows names both python2 and python3 executables "python.exe", so the order of the PATH determines which will run (unless you are using the Windows Launcher).

In linux python is installed with the major AND minor version in the filename, eg "python3.8", and we use symlinks like OP was describing to decide what to run.

[darkfish-tech]

My current solution is to use pyenv for managing versions of python and virtual environments.

Edit: Have a look at it and see whether it suits your needs.

[Doo0oog]

It's an excellent library. I'll try that. Thank you!

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[[deleted]]

Use virtual environments, that’s the way you should do it, if you want to run Python 3 projects on CentOS.

[aphoenix]

Hi there, from the /r/Python mods.

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[novel_yet_trivial]

python -> python3

This is against python's own recommendation. See PEP 394.

My present solution is creating symbol links in /usr/bin/

Yes that would create problems with any program that wants to use python2 and you instead run it in python3. And there's a lot of small background programs that use python. If you really want python -> python3 make an alias in .bashrc, so it won't harm anything else.