docstr: Generate a random credit card number.
  
  Returns (str): generated random credit card number.
code: def _generate_random_credit_card() -> str:
      """Generate a random credit card number.
  
      Returns (str): generated random credit card number.
      """
  
      groups = []
      for _i in range(4):
          group = "".join(random.choices("0123456789", k=4))
          groups.append(group)
      separator = random.choice(["-", " "])
      return separator.join(groups)
  
file_path: pandas-ai/pandasai/helpers/anonymizer.py
imports: import random
  import re
  import string
  import pandas
label_desc: Use image node_id 6 for calling the Anonymizer obj's underlying member method code with example usage: obj._generate_random_credit_card() and returns: separator