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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 purge_content(self, account_id, urls):
 """Purges one or more URLs from the CDN edge nodes. :param int account_id: the CDN account ID from which content should be purged. :param urls: a string or a list of strings representing the CDN URLs that should be purged. :returns: a list of SoftLayer_Container_Network_ContentDelivery_PurgeService_Response objects which indicates if the purge for each url was SUCCESS, FAILED or INVALID_URL. """


        if isinstance(urls, six.string_types):
            urls = [urls]

        content_list = []
        for i in range(0, len(urls), MAX_URLS_PER_PURGE):
            content = self.account.purgeCache(urls[i:i + MAX_URLS_PER_PURGE], id=account_id)
            content_list.extend(content)

        return content_list