class_docstr: A corpus reader used to access language An Crubadan n-gram files.
docstr: Return ISO 639-3 code given internal Crubadan code
docstr_tok: ["Return","ISO","639-3","code","given","internal","Crubadan","code"]
code: def crubadan_to_iso(self, lang):
      """Return ISO 639-3 code given internal Crubadan code"""
      for i in self._lang_mapping_data:
          if i[0].lower() == lang.lower():
              return i[1]
  
file_path: nltk/nltk/corpus/reader/crubadan.py
imports: import re
  from os import path
  from nltk.corpus.reader import CorpusReader
  from nltk.data import ZipFilePathPointer
  from nltk.probability import FreqDist
label_desc: Use image node_id 5 for calling the CrubadanCorpusReader obj's underlying member method code with example usage: obj.crubadan_to_iso(lang) and returns: i