code: def decode(self, codec_options=DEFAULT_CODEC_OPTIONS):
          
          if not isinstance(codec_options, CodecOptions):
              raise _CODEC_OPTIONS_TYPE_ERROR
  
          return _bson_to_dict(self, codec_options)
docs: Decode this BSON data.
  
          By default, returns a BSON document represented as a Python
          :class:`dict`. To use a different :class:`MutableMapping` class,
          configure a :class:`~bson.codec_options.CodecOptions`::
  
              >>> import collections  # From Python standard library.
              >>> import bson
              >>> from bson.codec_options import CodecOptions
              >>> data = bson.BSON.encode({'a': 1})
              >>> decoded_doc = bson.BSON.decode(data)
              <type 'dict'>
              >>> options = CodecOptions(document_class=collections.OrderedDict)
              >>> decoded_doc = bson.BSON.decode(data, codec_options=options)
              >>> type(decoded_doc)
              <class 'collections.OrderedDict'>
  
          :Parameters:
            - `codec_options` (optional): An instance of
              :class:`~bson.codec_options.CodecOptions`.
  
          .. versionchanged:: 3.0
             Removed `compile_re` option: PyMongo now always represents BSON
             regular expressions as :class:`~bson.regex.Regex` objects. Use
             :meth:`~bson.regex.Regex.try_compile` to attempt to convert from a
             BSON regular expression to a Python regular expression object.
  
             Replaced `as_class`, `tz_aware`, and `uuid_subtype` options with
             `codec_options`.
  
          .. versionchanged:: 2.7
             Added `compile_re` option. If set to False, PyMongo represented BSON
             regular expressions as :class:`~bson.regex.Regex` objects instead of
             attempting to compile BSON regular expressions as Python native
             regular expressions, thus preventing errors for some incompatible
             patterns, see `PYTHON-500`_.
  
          .. _PYTHON-500: https://jira.mongodb.org/browse/PYTHON-500