How to use the azure-cognitiveservices-search-customsearch.azure.cognitiveservices.search.customsearch.version.VERSION function in azure-cognitiveservices-search-customsearch

def __init__(
            self, credentials, base_url=None):

        if credentials is None:
            raise ValueError("Parameter 'credentials' must not be None.")
        if not base_url:
            base_url = 'https://api.cognitive.microsoft.com/bingcustomsearch/v7.0'

        super(CustomSearchClientConfiguration, self).__init__(base_url)

        self.add_user_agent('azure-cognitiveservices-search-customsearch/{}'.format(VERSION))

        self.credentials = credentials