docstr: Test that any punctuation chars are removed from wordchars
docstr_tok: ["Test","that","any","punctuation","chars","are","removed","from","wordchars"]
code: def testPunctuationInWordChars(self):
      """Test that any punctuation chars are removed from wordchars"""
      s = shlex.shlex("a_b__c", punctuation_chars="_")
      self.assertNotIn("_", s.wordchars)
      self.assertEqual(list(s), ["a", "_", "b", "__", "c"])
  
imports: import io
  import itertools
  import shlex
  import string
  import unittest
label_desc: Use image node_id 13 for calling the ShlexTest obj's underlying member method code with example usage: obj.testPunctuationInWordChars() without return types