Script File Failure-Path Error?

[snippsat]

Thanks again snippsat. So to confirm my understanding-when using cmd mode python does not appear to make any reference or use of Path and PYTHONPATH environment variables in searching for the script file, and so a full pathname must always be given unless starting from the directory containing the script file. Is that correct?

Yes.

Never do this.

C:\Users\jerry>hello_world.py

Now is the reliance on that file associations is correct and this can suddently change.
Use python,the you know that it will use Python 3.11.

C:\Users\jerry>python hello_world.py

Also when you later when need to configure editor/IDE you point to python.exe and what file associations is set to dosn't matter.

# A test to make sure with full path to python.exe
C:\Users>python -c "import sys; print(sys.executable)"
C:\python310\python.exe

You could also look into py,can by used to run any python version.
See that i have python 3.11,but still have python in OS Path that point to 3.10

# <py> will find newest one and don't care about what is OS path
G:\div_code
λ py -V
Python 3.11.0

G:\div_code
λ python -V
Python 3.10.5

I have some versions as you see👀

G:\div_code
λ py --list
 -V:3.11 *        Python 3.11 (64-bit)
 -V:3.10          Python 3.10 (64-bit)
 -V:3.9           Python 3.9 (64-bit)
 -V:3.8           Python 3.8 (64-bit)
 -V:3.7-32        Python 3.7 (32-bit)
 -V:3.6-32        Python 3.6 (32-bit)
 -V:3.5-32
 -V:3.4
 -V:2.7
 -V:2.1
 -V:ContinuumAnalytics/Anaconda39-64 Anaconda py39_4.9.2
 -V:ContinuumAnalytics/Anaconda37-64 Anaconda 4.7.12
 -V:ContinuumAnalytics/Anaconda36-32 Anaconda 4.3.14