class_docstr: This is a class to read the PanLex Swadesh list from
  
  David Kamholz, Jonathan Pool, and Susan M. Colowick (2014).
  PanLex: Building a Resource for Panlingual Lexical Translation.
  In LREC. http://www.lrec-conf.org/proceedings/lrec2014/pdf/1029_Paper.pdf
  
  License: CC0 1.0 Universal
  https://creativecommons.org/publicdomain/zero/1.0/legalcode
docstr: :return: a list of list(str)
docstr_tok: [":","return",":","a","list","of","list","(","str",")"]
code: def words_by_iso639(self, iso63_code):
      """
      :return: a list of list(str)
      """
      fileids = [
          f"swadesh{self.swadesh_size}/{lang_code}.txt"
          for lang_code in self._macro_langauges[iso63_code]
      ]
      return [
          concept.split("\t")
          for fileid in fileids
          for concept in self.words(fileid)
      ]
  
file_path: nltk/nltk/corpus/reader/panlex_swadesh.py
imports: import re
  from collections import defaultdict, namedtuple
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.util import *
  from nltk.corpus.reader.wordlist import WordListCorpusReader
  from nltk.tokenize import line_tokenize
label_desc: Use image node_id 7 for calling the PanlexSwadeshCorpusReader obj's underlying member method code with example usage: obj.words_by_iso639(iso63_code) and returns: unknown