To resolve the issue where importing Python modules repeatedly using PyImport_ImportModule in a Qt application fails, follow these steps:
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Check for Exceptions: After each call to PyImport_ImportModule, check if an exception occurred by calling ctypes.pythonapi.PyErr_Occurred(). If an error is detected, retrieve the error message using ctypes.pythonapi.PyErr_GetString().
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Inspect sys.modules: Ensure that each imported module is correctly added to sys.modules after a successful import. This can be done by manually checking the keys in sys.modules or adding print statements during debugging.
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Verify Module Name Consistency: Confirm that the module name passed to PyImport_ImportModule is consistent across all calls, without any leading or trailing spaces or case differences.
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Handle Module Cache Manually: If modules are not being cached correctly, manually add them to sys.modules after importing via PyImport_ImportModule. This ensures that subsequent imports can find the module from the cache.
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Reinitialize Python State if Necessary: If the issue persists, consider reinitializing the Python interpreter or managing global state between import calls to ensure consistency.
By implementing these steps, you should be able to identify and fix the cause of repeated import failures in your Qt application.