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Can anyone help me how to manage both versions in one Windows 10.
Just install Python 3.7 and Python 3.8 and make sure that the Python Launcher for Windows is also installed (this is the default).
Then run your scripts using py -3.7 main.py or py -3.8 main.py to run main.py using Python versions 3.7 or 3.8, respectively.
Alternatively (even better actually), you could write the required Python version in the first line of your Python script:
#!/usr/bin/env python3.7
Note : this must be on the first line of the script, otherwise it doesn't work. Now just running py main.py would automatically select the correct Python version to execute the script.