code: def _tuple_str(obj_name, fields):
      # Return a string representing each field of obj_name as a tuple
      # member.  So, if fields is ['x', 'y'] and obj_name is "self",
      # return "(self.x,self.y)".
  
      # Special case for the 0-tuple.
      if not fields:
          return "()"
      # Note the trailing comma, needed if this turns out to be a 1-tuple.
      return f'({",".join([f"{obj_name}.{f.name}" for f in fields])},)'
  
imports: import re
  import sys
  import copy
  import types
  import inspect
  import keyword
label_desc: Use image node_id 2 for calling a global function with example usage: _tuple_str(obj_name, fields) and returns: str, str, str, str