This decorator restore the original namespace after the function has been executed in appengine.

restore_namespace_after_function.py

def restore_namespace_after(func):
    """Decorator that ensures that restore the original namespace after the function has 
       been executed in appengine."""
    @functools.wraps(func)
    def decorated_func(*args, **kwargs):
        namespace = namespace_manager.get_namespace()
        res = func(*args, **kwargs)
        namespace_manager.set_namespace(namespace)
        return res
    return decorated_func