File: //lib64/python3.9/__pycache__/pkgutil.cpython-39.pyc
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    on path, or, if path is None, all accessible modules.
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    on output.
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    modules!) on the given path, in order to access the __path__
    attribute to find submodules.
    'onerror' is a function which gets called with one argument (the
    name of the package which was being imported) if any exception
    occurs while trying to import a package.  If no onerror function is
    supplied, ImportErrors are caught and ignored, while all other
    exceptions are propagated, terminating the search.
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    # list all submodules of ctypes
    walk_packages(ctypes.__path__, ctypes.__name__+'.')
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