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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 read_all(filename):
 """ Reads the serialized objects from disk. Caller must wrap objects in appropriate Python wrapper classes. :param filename: the file with the serialized objects :type filename: str :return: the list of JB_OBjects :rtype: list """

    array = javabridge.static_call(
        "Lweka/core/SerializationHelper;", "readAll",
        "(Ljava/lang/String;)[Ljava/lang/Object;",
        filename)
    if array is None:
        return None
    else:
        return javabridge.get_env().get_object_array_elements(array)