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

[jerryf]

snappsat - thanks yet again for your response.
It was the file association vs python behaviour I was trying to understand, especially why the first option appeared to interact with the Windows Path environment but invoking python explicitly did not.

However, I can understand the logic of your suggestion to use the explicit [inline]python{/inline] method, but remembering to include the full pathname unless the file is in the current directory. Still seems a little odd but suspect this behaviour might be specific to the Windows implementation.

Am now going to investigate absolute and relative paths when using the interactive mode for building multi-module/package applications so that I can set up sensible folder structures for developing future projects.

Many thanks again for your guidance

[snippsat]

Am now going to investigate absolute and relative paths when using the interactive mode for building multi-module/package applications so that I can set up sensible folder structures for developing future projects

Can give some tips,a advice for a better command line cmder
Also Shortcut to open Cmder in a chosen folder
Then can go from File Explorer direclty to any folder.

Also should now about Virtual Enviroment(build into Python) this i use always when build module/packages.
When use virtual enviroment will be isolated from all other Python version and get own sys.path
Example,and not using python command now would mess all this up.

# Make 
G:\div_code
λ python -m venv my_env

# Cd in
G:\div_code
λ cd my_env

# Activate
G:\div_code\my_env
λ G:\div_code\my_env\Scripts\activate

# Test path,see that it point only to this folder
(my_env) G:\div_code\my_env
λ python -c "import sys; print(sys.executable)"
G:\div_code\my_env\Scripts\python.exe

(my_env) G:\div_code\my_env
λ pip -V
pip 22.0.4 from G:\div_code\my_env\lib\site-packages\pip (python 3.10)

So if install something eg Requset it can not be confilcts as this is isolated.

(my_env) G:\div_code\my_env
λ pip install requests
Collecting requests
  Using cached requests-2.28.1-py3-none-any.whl (62 kB)
Collecting urllib3<1.27,>=1.21.1
  Downloading urllib3-1.26.13-py2.py3-none-any.whl (140 kB)
     ---------------------------------------- 140.6/140.6 KB 2.1 MB/s eta 0:00:00
Collecting charset-normalizer<3,>=2
  Using cached charset_normalizer-2.1.1-py3-none-any.whl (39 kB)
Collecting certifi>=2017.4.17
  Using cached certifi-2022.9.24-py3-none-any.whl (161 kB)
Collecting idna<4,>=2.5
  Using cached idna-3.4-py3-none-any.whl (61 kB)
Installing collected packages: urllib3, idna, charset-normalizer, certifi, requests
Successfully installed certifi-2022.9.24 charset-normalizer-2.1.1 idna-3.4 requests-2.28.1 urllib3-1.26.13

(my_env) G:\div_code\my_env
λ pip list
Package            Version
------------------ ---------
certifi            2022.9.24
charset-normalizer 2.1.1
idna               3.4
pip                22.0.4
requests           2.28.1
setuptools         58.1.0
urllib3            1.26.13

[jerryf]

Thanks for your latest comments.

I had already started looking at virtual environments in the python documentation so your feedback is timely.

I wasn't aware of cmdr so will take a look at that as well.