capybara/virtualenv/lib/python2.7/site-packages/flask/blueprints.py
def errorhandler(self, code_or_exception):
        """Registers an error handler that becomes active for this blueprint
        only.  Please be aware that routing does not happen local to a
        blueprint so an error handler for 404 usually is not handled by
        a blueprint unless it is caused inside a view function.  Another
        special case is the 500 internal server error which is always looked
        up from the application.

        Otherwise works as the :meth:`~flask.Flask.errorhandler` decorator
        of the :class:`~flask.Flask` object.
        """
        def decorator(f):
            self.record_once(lambda s: s.app._register_error_handler(
                self.name, code_or_exception, f))
            return f
        return decorator
def errorhandler(self, code_or_exception):
        """Registers an error handler that becomes active for this blueprint
        only.  Please be aware that routing does not happen local to a
        blueprint so an error handler for 404 usually is not handled by
        a blueprint unless it is caused inside a view function.  Another
        special case is the 500 internal server error which is always looked
        up from the application.

        Otherwise works as the :meth:`~flask.Flask.errorhandler` decorator
        of the :class:`~flask.Flask` object.
        """
        def decorator(f):
            self.record_once(lambda s: s.app._register_error_handler(
                self.name, code_or_exception, f))
            return f
        return decorator
Registers an error handler that becomes active for this blueprint
        only.  Please be aware that routing does not happen local to a
        blueprint so an error handler for 404 usually is not handled by
        a blueprint unless it is caused inside a view function.  Another
        special case is the 500 internal server error which is always looked
        up from the application.

        Otherwise works as the :meth:`~flask.Flask.errorhandler` decorator
        of the :class:`~flask.Flask` object.