code: def test_is_valid_phone_number(self):
      assert (
          Anonymizer._is_valid_phone_number("+1 (123) 456-7890") is True
      )
      assert Anonymizer._is_valid_phone_number("123-456-789") 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 2 for calling the TestAnonymizeDataFrameHead obj's underlying member method code with example usage: obj.test_is_valid_phone_number() without return types