ImportError: No module named Crypto

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Same as my comment on another answer, pip is not recommended esp. for longer term development.

I passed that stage installing pycryptodomex but now I'm at ModuleNotFoundError: No module named 'gnupg'

How did you solve the problem? Thanks.

I eventually gave up. I don't remember the problem exactly, IIRC I was trying to read the messages from the rosbag directly without doing rosbag play. In any case, my problem was elsewhere, I was losing packets because the pipeline in the rest of my code was too slow, so I solved it by optimizing the rest of the code.

I solved the problem by ran conda install -c conda-forge python-gnupg just now. Using ros and anaconda simultaneously maybe the cause of my problem. Thanks anyway.

I checked out my git log, I gave up upon reaching the import roslz4 necessary to replay my bags. I didn't find the way to import it because it was Python 2.7 only and I was using Python 3.6. So unrelated to gnupg at the end of the day.

Beside my post https://answers.ros.org/question/3311... is likely more proper fix, using pipis _ok_ but in general not recommended esp. if you're making software that's meant to be maintained longer term. FYI there's lengthy discussion https://discourse.ros.org/t/should-we...