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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 default_classification_value_maps(classification):
 """Helper to get default value maps from classification. :param classification: Classification definition. :type classification: dict :returns: Dictionary with key = the class key and value = default strings. :rtype: dict """

    value_maps = {}
    for hazard_class in classification['classes']:
        value_maps[hazard_class['key']] = hazard_class.get(
            'string_defaults', [])

    return value_maps