ImportError: No module named – Python

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Your modification of sys.path assumes the current working directory is always in main/. This is not the case. Instead, just add the parent directory to sys.path:

import sys
import os.path

sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
import gen_py.lib

Don’t forget to include a file __init__.py in gen_py and lib – otherwise, they won’t be recognized as Python modules.

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