I'm getting a 'ModuleNotFoundError' after installing a Python package in an externally managed environment. What could be the cause?

A `ModuleNotFoundError` usually means the package wasn't installed correctly or isn't accessible in the current environment. Verify the package is listed in `pip list` or `conda list` (depending on how you installed it). Ensure you've activated the correct virtual environment (if using one). Check your `PYTHONPATH` environment variable; it might be overriding the default package search paths. Sometimes, a simple `pip install --upgrade ` can resolve the issue.

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Answered on 29 Agustus 2025