How to config python virtual environment with a specific python version?

Question

I wanna make python virtual environment.

my WSL default python version is 3.8

As I know, two methods are...

`python -m venv .venv'
.venv is created default python version 3.8.
It's fine and no problem.
python -version -m venv .venv
ex. python -3.8 -m venv .venv

$ python -3.11 -m venv .venv
Unknown option: -3
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `python -h' for more information.

what is wrong above command? Thank you in advance.

(Refer to above paragraph.)

I wanna use venv command. (not virtualenv)

You need to install Python 3.11 first, and not to mention the -3 is not a flag that you can pass into python hence the error message. You might be thinking of using something like pyenv instead to find/manage specific Python versions? — metatoaster
– metatoaster, Commented Jan 16, 2023 at 3:19

simpleApp · Accepted Answer · 2023-01-16 04:15:20Z

python version depends on version venv module called from. for example one way would be:

%python --version
Python 3.8.3

%python -m venv venvpy3.8

if activate the env with the default version which is 3.8.3 here.

to find all python versions in my system, following script helps:

from os import listdir
from os.path import isfile, join
import re
python_re=r"^python\d"
path=os.environ["PATH"]
probable_python_versions=[]
for e_path in path.split(":"):
    python_versions=[os.path.join(e_path,file_folder) for file_folder in listdir(e_path) if isfile(join(e_path, file_folder)) and (re.match(r"^python\d\.\d+$",file_folder)) ]
    probable_python_versions.extend(python_versions)
print(probable_python_versions)

so it provides a list as

['/opt/anaconda3/bin/python3.8',
 '/Library/Frameworks/Python.framework/Versions/3.8/bin/python3.8',
 '/usr/local/bin/python3.8',
 '/usr/local/bin/python3.11',
 '/usr/local/bin/python3.9',
 '/usr/bin/python2.7']

now a need is for virtual env with 3.11, a way would be % /usr/local/bin/python3.11 -m venv venvpy3.11 and can activate and this env will have python 3.11

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