class_docstr: This class implements a dummy wrapper to fix a bug in the Python
  standard library for string formatting.
  
  See https://bugs.python.org/issue13598 for information about why
  this is necessary.
code: def __init__(self, args, kwargs):
      self._args = args
      self._kwargs = kwargs
      self._last_index = 0
  
imports: import operator
  import types
  import warnings
  from collections import deque
  from string import Formatter
  from markupsafe import EscapeFormatter
  from markupsafe import Markup
  from ._compat import abc
  from ._compat import PY2
  from ._compat import range_type
  from ._compat import string_types
  from .environment import Environment
  from .exceptions import SecurityError
label_desc: Use image node_id 1 to create a new _MagicFormatMapping object from inherited base classes: abc with example: obj = _MagicFormatMapping(args, kwargs)