windows - Module can be imported in python but cannot be used from command line

Question

This is essentially the opposite of this problem: Import module works in terminal but not in IDLE

If I start a python session and try to import flask, then it works just fine. Despite that, if I just run flask from the terminal, it is not recognized.

I have confirmed that the locations which pip installs to is on my system path. (I'm on Windows 10 and I typed $Env:Path into Powershell to see that, for example, C:UsersackAppDataRoamingPythonPython37site-packages is in the system path.)

I am also sure that I did pip install --user flask not inside a virtual environment. When I run import flask; print(flask.__file__ I see C:UsersackAppDataRoamingPythonPython37site-packages)

Any other ideas for what could be going wrong?

Edit: I'm trying to run flask run. To check the path python uses, I did (in python) import sys; for i in sys.path: print(i)

Answer 1

As Python language based on Python interpreter, before you use Python, it is necessarily to activate the Python env.