code: def test_is_valid_credit_card(self):
      assert (
          Anonymizer._is_valid_credit_card("1234-5678-9012-3456")
          is True
      )
      assert Anonymizer._is_valid_credit_card("1234-5678-9012") is False
  
file_path: pandas-ai/tests/helpers/test_anonymizer.py
imports: import pandas
  from pandasai.helpers.anonymizer import Anonymizer
label_desc: Use image node_id 3 for calling the TestAnonymizeDataFrameHead obj's underlying member method code with example usage: obj.test_is_valid_credit_card() without return types