CODEWITHSUNDEEP
pythoncryptographyfernet
Wolfgang Ebert
Wolfgang Ebert

Reputation: 1

Python: 'No module named 'cryptography'' even if calling another function in the same script works

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:

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'

Upvotes: 0

Views: 460

Answers (2)

Wolfgang Ebert
Wolfgang Ebert

Reputation: 1

The solution is really simple: the problem sits in front of the computer. It was the call of python3, which calls the python-executable outside the virtual environment, instead the python inside the venv. And because I'm not installing any modules in the global environment, the missing module couldn't be found!

Thx to @bereal

Upvotes: 0

thamodrensinniah
thamodrensinniah

Reputation: 38

By any chance you are using PyCharm? You could try adding and/or switching your interpreter. It's located at the bottom left. Left of your current working git branch.

Configure a virtual environment in PyCharm

I had a somewhat similar issue where a package I imported was not found although in my terminal I see my virtual environment was set to (venv), which was the virtual environment that had this package installed into. Even did a pip list just like you and it was there. I ran the script on my terminal and it worked fine but directly running it on PyCharm by right clicking the file and running did not work.

If that did not help, try running the script via the terminal with the correct virtual environment active and see if that works.

Upvotes: 0

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