def get_class(class_name):
    """
    Get a class module from its name.
    :param class_name: Full name of a class.
    :type class_name: `str`
    :return: The class `module`.
    :rtype: `module`
    """
    sub_mods = class_name.split(".")
    module_ = __import__(".".join(sub_mods[:-1]), fromlist=sub_mods[-1])
    class_module = getattr(module_, sub_mods[-1])

    return class_module