[Python] Python: 'No module named 'cryptography'' even if calling another function in the same...

If I call "generateKey" from the script below, everything works fine and the keyfile will be generated. But if I call "cryptkey" the error No module named 'cryptography' will occur.

import cryptography.fernet

def generateKey(keyfile : str):
key = cryptography.fernet.Fernet.generate_key()

with open (keyfile, "bw") as fp:
fp.write (key)

def cryptkey(stringData : str, keyfile : str) -> str:
symkey = None

with open (keyfile,"r") as fp:
symkey = fp.read()

crypter = cryptography.fernet.Fernet(symkey)
crypted_text = crypter.encrypt(stringData.encode())

return(crypted_text.decode())


I'm working in a virtual environment, with this modules installed:

(venv) E:\Projekte\...>pip list
Package Version
------------------ ---------
artifactory 0.1.17
certifi 2023.7.22
cffi 1.15.1
charset-normalizer 3.2.0
coverage 7.2.7
cryptography 41.0.3
idna 3.4
oracledb 1.3.2
pathlib 1.0.1
pip 23.2.1
pycparser 2.21
python-dateutil 2.8.2
requests 2.31.0
setuptools 65.5.0
six 1.16.0
urllib3 2.0.4
xmltodict 0.13.0

My python-version is

(venv) E:\Projekte\...>python --version

Python 3.10.11


What did I tried:

• Reinstalled the module
• Removed all "pycache" folders
• Rebooted my computer
• Removed and reinstalled the virtual environment

Commands and output:

(venv) E:\Projekte...>python -c "import keyFunctions.keyFunctions as kf; kf.generateKey('keyfile.txt')"

(venv) E:\Projekte...>python3 -c "import keyFunctions.keyFunctions as kf; print(kf.cryptkey('blubb', 'keyfile.txt'));"

Traceback (most recent call last): File "", line 1, in File "E:\Projekte...\keyFunctions\keyFunctions.py", line 1, in from cryptography import fernet ModuleNotFoundError: No module named 'cryptography'

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