code: def test_stringize_deep_nested():
      assert strings.stringize_deep(
          {
              "key 1": "value 1",
              "ключ 2": {
                  "subkey 1": "value 1",
                  "подключ 2": "value 2",
              },
          }
      ) == {
          "key 1"
          if six.PY2
          else b"key 1": "value 1"
          if six.PY2
          else b"value 1",
          "ключ 2".encode("utf-8"): {
              ("subkey 1" if six.PY2 else b"subkey 1"): "value 1"
              if six.PY2
              else b"value 1",
              "подключ 2".encode("utf-8"): "value 2".encode("utf-8"),
          },
      }
  
imports: import pytest
  import six
  from library.python import strings
label_desc: Use image node_id 11 for calling a global function with example usage: test_stringize_deep_nested() without return types