How to make sure python script uses virtual environment?

Question

I created virtual environment and activate it. installed packages but unable to import them from virtual environment.

pip freeze:

But

Answer 1

In many cases it's not necessary to activate a virtual environment. Typically you could do something like the following from anywhere without activating the virtual environment:

• C:\path\to\venv\Scripts\python.exe -m pip somecommand
• C:\path\to\venv\Scripts\python.exe different\path\to\script.py
• etc.

Additionally you could specify the absolute path to the python.exe as a she-bang at the top of your Python script, and execute the script directly (for example with a double-click) without calling Python explicitly.

#!/path/to/venv/bin/python3

print("Hello world")

References:

• https://docs.python.org/3/using/windows.html#shebang-lines
• https://docs.python.org/3/library/venv.html#creating-virtual-environments

Answer 2

You should invoke the python that is installed within your environment. That is

source myenv/bin/activate
python path/to/script.py

In Unix, you would add the following #!/usr/bin/env python at the top of your script and this would allow you to run it without specifying the python binary.

source myenv/bin/activate
path/to/script.py

Possibly that works in Windows in the same way or differently.