code: def __repr__(cls):
      return "Product[{}]".format(", ".join(map(repr, cls.__args__)))
  
imports: import copyreg
  import functools
  import inspect
  import operator
  import warnings
  from functools import reduce
  from weakref import WeakValueDictionary
  import funsor.ops
  from funsor.ops.builtin import parse_ellipsis, parse_slice
  from funsor.util import broadcast_shape, get_backend, get_tracing_state, quote
label_desc: Use image node_id 2 for calling the ProductDomain obj's underlying member method code with example usage: obj.__repr__(cls) and returns: str