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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def import_string(dotted_path):
 """ Import a dotted module path. Returns the attribute/class designated by the last name in the path. Raises ImportError if the import fails. """

    try:
        module_path, class_name = dotted_path.rsplit('.', 1)
    except ValueError:
        raise ImportError('%s doesn\'t look like a valid path' % dotted_path)

    module = __import__(module_path, fromlist=[class_name])

    try:
        return getattr(module, class_name)
    except AttributeError:
        msg = 'Module "%s" does not define a "%s" attribute/class' % (
            dotted_path, class_name)
        raise ImportError(msg)