Python 3 is mainstream and Python 2 is effectively retired. There is one more release coming in April, but the code has been frozen, and it's no longer supported.
If I'm starting a new project, I use Python 3.7 which is also my system-wide default.
If I'm working on a community library, test against 3.6, 3.7, and 3.8.
Once Python 3.8.2 or 3.8.3 is out (currently on 3.8.1), I'll switch my system-wide default over to it.
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Python 3 is mainstream and Python 2 is effectively retired. There is one more release coming in April, but the code has been frozen, and it's no longer supported.
If I'm starting a new project, I use Python 3.7 which is also my system-wide default.
If I'm working on a community library, test against 3.6, 3.7, and 3.8.
Once Python 3.8.2 or 3.8.3 is out (currently on 3.8.1), I'll switch my system-wide default over to it.