hookenv.py 文件源码

def cached(func):
    """Cache return values for multiple executions of func + args

    For example::

        @cached
        def unit_get(attribute):
            pass

        unit_get('test')

    will cache the result of unit_get + 'test' for future calls.
    """
    @wraps(func)
    def wrapper(*args, **kwargs):
        global cache
        key = str((func, args, kwargs))
        try:
            return cache[key]
        except KeyError:
            pass  # Drop out of the exception handler scope.
        res = func(*args, **kwargs)
        cache[key] = res
        return res
    wrapper._wrapped = func
    return wrapper