Advice for installing python app from github ?

[snippsat]

I am still confused about ow to create a virtual environment, i open the CMD window as suggested, and do not type "py" ?

Just use py to generate the environment.

py -m venv photo_env

Then the rest will be the same.

If Path is correct python and py will work the same.
Test with:

G:\div_code
λ python -V
Python 3.11.3

G:\div_code
λ py -V
Python 3.11.3

G:\div_code
λ pip -V
pip 23.1.2 from C:\python311\Lib\site-packages\pip (python 3.11)

py will always work as it dos not use OS environment path.

Virtualenv is 3-party libayr that need to install .
But is no not needed.

Since Python 3.3, a subset of it has been integrated into the standard library under the venv module.