How to test if a module exists?

Discussion in 'Python' started by Jon Dufresne, Nov 6, 2010.

  1. Jon Dufresne

    Jon Dufresne Guest


    My python program has an extension system where the extension can have
    a optional magic python modules. Meaning if the extension module
    exists, the program will use it and if not, it will continue without
    the module. So my program tests if a module exists, if so use it,
    otherwise continue. This is how I originally did this (pseudo code):

    import extension_magic_module
    except ImportError:

    However, if the the extension module exists but throws an ImportError,
    due to a bug in the extension this idiom will mask the error and I
    will never see it. Later on in the program I will get unexpected
    behavior because the module never successfully imported. I want the
    program to fail if the extension module fails to import, but continue
    if the module doesn't exist. Is there a correct way to handle this?

    Jon Dufresne, Nov 6, 2010
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