class_docstr: Transforms an input to upper and lower case or capitalize case.
  A sentence can only be transformed into one sentence of each case at most.
code: def __repr__(self):
      return "WordCase" + "_" + self.case_type
  
file_path: textflint/textflint/generation/transformation/UT/word_case.py
imports: import random
  from ..transformation import Transformation
label_desc: Use image node_id 2 for calling the WordCase obj's underlying member method code with example usage: obj.__repr__() and returns: unknown