I have solved a most of part:
C:\>python -V
Python 3.8.5
C:\>python -c "import sys; print(sys.executable)"
C:\Python\python.exe
C:\>pip -V
pip 20.2.3 from c:\python\lib\site-packages\pip (python 3.8)
Now I have to solve to run Python in VS2017 because there is no point to install VS code as long as I already have VS2017. And in this case, I got "Debugging is not supported for Python 2.5 and earlier" ... strange message ...
C:\>python -V
Python 3.8.5
C:\>python -c "import sys; print(sys.executable)"
C:\Python\python.exe
C:\>pip -V
pip 20.2.3 from c:\python\lib\site-packages\pip (python 3.8)
Now I have to solve to run Python in VS2017 because there is no point to install VS code as long as I already have VS2017. And in this case, I got "Debugging is not supported for Python 2.5 and earlier" ... strange message ...