class_docstr: DIGIT类
class_docstr_tok: ["DIGIT\u7c7b"]
code: def digit2chntext(self):
      return num2chn(self.digit, alt_two=False, use_units=False)
  
imports: import argparse
  import codecs
  import os
  import re
  import string
  import sys
label_desc: Use image node_id 2 for calling the Digit obj's underlying member method code with example usage: obj.digit2chntext() and returns: num2chn