code: def __repr__(self) -> str:
      return f"{self.__class__.__name__}({str(self)})"
  
imports: import bisect
  from datetime import datetime, time, date, timedelta
  from typing import List, Optional, Tuple, Union
  import functools
  import re
  import pandas
  from qlib.config import C
  from qlib.constant import REG_CN, REG_TW, REG_US
label_desc: Use image node_id 4 for calling the Freq obj's underlying member method code with example usage: obj.__repr__() and returns: self, str, str, str