class_docstr: Metaclass for ``Kind``.
  
  Assigns empty ``dict`` as class attribute ``_inst`` for every class,
  in order to endow singleton-like behavior.
class_docstr_tok: ["Metaclass","for","``","Kind","``",".","Assigns","empty","``","dict","``","as","class","attribute","``","_inst","``","for","every","class",",","in","order","to","endow","singleton-like","behavior","."]
code: def __new__(cls, clsname, bases, dct):
      dct["_inst"] = {}
      return super().__new__(cls, clsname, bases, dct)
  
imports: from collections import defaultdict
  from .cache import cacheit
  from sympy.multipledispatch.dispatcher import Dispatcher, ambiguity_warn, ambiguity_register_error_ignore_dup, str_signature, RaiseNotImplementedError
label_desc: Use image node_id 1 for calling the KindMeta obj's underlying member method code with example usage: obj.__new__(cls, clsname, bases, dct) and returns: super