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Get the Python object named by a given module and member name.

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        >>> doc.splitlines()[0]
        'Get the Python object named by a given module and member name.'

    :param module_name: a module name, as would be found in sys.modules if
        the module is already imported.  It may contain dots.  e.g. 'sys' or
        'os.path'.
    :param member_name: (optional) a name of an attribute in that module to
        return.  It may contain dots.  e.g. 'MyClass.some_method'.  If not
        given, the named module will be returned instead.
    :raises: ImportError or AttributeError.
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Determine the 'parent' of a given dotted module name and (optional)
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