How to downgrade python version on CentOS?
Instead of literally downgrading, I would consider virtualenv. It lets you create isolated python environments, including the specific python version and the modules.
You can always install a different version of Python using the -altinstall argument, and then run it either in a virtual environment, or just run the commands with python(version) command.
A considerable amount of CentOS is written in Python so changing the core version will most likely break some functions.
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