code: def insert_one(self, document, bypass_document_validation=False):
          
          common.validate_is_document_type("document", document)
          if not (isinstance(document, RawBSONDocument) or "_id" in document):
              document["_id"] = ObjectId()
          with self._socket_for_writes() as sock_info:
              return InsertOneResult(
                  self._insert(sock_info, document,
                               bypass_doc_val=bypass_document_validation),
                  self.write_concern.acknowledged)
docs: Insert a single document.
  
            >>> db.test.count({'x': 1})
            0
            >>> result = db.test.insert_one({'x': 1})
            >>> result.inserted_id
            ObjectId('54f112defba522406c9cc208')
            >>> db.test.find_one({'x': 1})
            {u'x': 1, u'_id': ObjectId('54f112defba522406c9cc208')}
  
          :Parameters:
            - `document`: The document to insert. Must be a mutable mapping
              type. If the document does not have an _id field one will be
              added automatically.
            - `bypass_document_validation`: (optional) If ``True``, allows the
              write to opt-out of document level validation. Default is
              ``False``.
  
          :Returns:
            - An instance of :class:`~pymongo.results.InsertOneResult`.
  
          .. seealso:: :ref:`writes-and-ids`
  
          .. note:: `bypass_document_validation` requires server version
            **>= 3.2**
  
          .. versionchanged:: 3.2
            Added bypass_document_validation support
  
          .. versionadded:: 3.0