class_docstr: Interface for categories in combinatory grammars.
class_docstr_tok: ["Interface","for","categories","in","combinatory","grammars","."]
code: def __str__(self):
      pass
  
imports: from abc import ABCMeta, abstractmethod
  from functools import total_ordering
  from nltk.internals import raise_unorderable_types
label_desc: Use image node_id 6 for calling the AbstractCCGCategory obj's underlying member method code with example usage: obj.__str__() without return types