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Utility functions for finding modules on sys.path.

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    Find module `module_name` on sys.path, and return the path to module `module_name`.

    * If `module_name` refers to a module directory, then return path to `__init__` file.
        * If `module_name` is a directory without an __init__file, return None.

    * If module is missing or does not have a `.py` or `.pyw` extension, return None.
        * Note that we are not interested in running bytecode.

    * Otherwise, return the fill path of the module.

    Parameters
    ----------
    module_name : str

    Returns
    -------
    module_path : str
        Path to module `module_name`, its __init__.py, or None,
        depending on above conditions.
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