class_docstr: Mapping that supports bytes keys
class_docstr_tok: ["Mapping","that","supports","bytes","keys"]
code: def __delitem__(self, key):
      del self.d[L1(key)]
  
imports: import unittest
  import dbm
  import shelve
  import pickle
  import os
  from test.support import os_helper
  from collections.abc import MutableMapping
  from test.test_dbm import dbm_iterator
  from test import mapping_tests
label_desc: Use image node_id 4 for calling the byteskeydict obj's underlying member method code with example usage: obj.__delitem__(key) without return types