class_docstr: A collection of options, a dictionary with object-like access.
  
  Normally accessed via static functions in the `tornado.options` module,
  which reference a global instance.
class_docstr_tok: ["A","collection","of","options",",","a","dictionary","with","object-like","access",".","Normally","accessed","via","static","functions","in","the","`","tornado.options","`","module",",","which","reference","a","global","instance","."]
docstr: Returns a wrapper around self that is compatible with
  `mock.patch <unittest.mock.patch>`.
  
  The `mock.patch <unittest.mock.patch>` function (included in
  the standard library `unittest.mock` package since Python 3.3,
  or in the third-party ``mock`` package for older versions of
  Python) is incompatible with objects like ``options`` that
  override ``__getattr__`` and ``__setattr__``.  This function
  returns an object that can be used with `mock.patch.object
  <unittest.mock.patch.object>` to modify option values::
  
      with mock.patch.object(options.mockable(), 'name', value):
          assert options.name == value
code: def mockable(self) -> "_Mockable":
      """Returns a wrapper around self that is compatible with
      `mock.patch <unittest.mock.patch>`.
  
      The `mock.patch <unittest.mock.patch>` function (included in
      the standard library `unittest.mock` package since Python 3.3,
      or in the third-party ``mock`` package for older versions of
      Python) is incompatible with objects like ``options`` that
      override ``__getattr__`` and ``__setattr__``.  This function
      returns an object that can be used with `mock.patch.object
      <unittest.mock.patch.object>` to modify option values::
  
          with mock.patch.object(options.mockable(), 'name', value):
              assert options.name == value
      """
      return _Mockable(self)
  
imports: import datetime
  import numbers
  import re
  import sys
  import os
  import textwrap
  from tornado.escape import _unicode, native_str
  from tornado.log import define_logging_options
  from tornado.util import basestring_type, exec_in
  from typing import Any, Iterator, Iterable, Tuple, Set, Dict, Callable, List, TextIO, Optional
label_desc: Use image node_id 20 for calling the OptionParser obj's underlying member method code with example usage: obj.mockable() and returns: _Mockable