code: def _std_string(s):
      """Cast a string or byte string to an ASCII string."""
      return str(s.decode("ASCII"))
  
imports: from datetime import datetime
  from struct import unpack, calcsize
  from pytz.tzinfo import StaticTzInfo, DstTzInfo, memorized_ttinfo
  from pytz.tzinfo import memorized_datetime, memorized_timedelta
label_desc: Use image node_id 2 for calling a global function with example usage: _std_string(s) and returns: str