Is there a agreement about the lowest Python version supported for 0.20?
In Python 3.6 f strings where introduced. Means if we start to use f strings we would not support Python < 3.6 anymore ...
https://realpython.com/python-f-strings/
Which python is supported by FreeCAD 0.20?
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Re: which python is supported by FreeCAD 0.20
At the moment the minimum supported version is 3.5 (IIRC). Since for the oldest supported Ubuntu version (Bionic) Python is 3.6.9 it's IMO okay to lift the minimum version to 3.6.