python 装饰器有关的问题

[LaoLiulaoliu]

1.装饰器问题。我注释掉的那一行代码，添加上也可以正常执行。原程序是有这一行的，我没懂所以注释掉了。句法：装饰器包装函数.装饰器函数 = {} (fmemo.memo = table)

def memo(f):
    "Memoize function f."
    table = {}
    def fmemo(*args):
        if args not in table:
            table[args] = f(*args)
        return table[args]
##    fmemo.memo = table
    return fmemo

@memo
def segment(text):
    "Return a list of words that is the best segmentation of text."
    if not text: return []
    candidates = ([first]+segment(rem) for first,rem in splits(text))
    return max(candidates, key=Pwords)

其实不用管代码逻辑，只要看看语法就好。问题感觉从来没接触过，谢谢。

[iambic]

什么问题？

[angel_su]

貌似就只是加个属性记住table，那么后面代码里，你可以用segment.momo来读取这个table

[LaoLiulaoliu]

测试了一下，就是楼上说的这个意思。不知道哪里可以找到这个语法的文档，谢谢。

[angel_su]

看看文档有关language reference 3.1节提到：
...
Function objects also support getting and setting arbitrary attributes, which can be used, for example, to attach metadata to functions. Regular attribute dot-notation is used to get and set such attributes. Note that the current implementation only supports function attributes on user-defined functions. Function attributes on built-in functions may be supported in the future.
...

[LaoLiulaoliu]

楼上太强了，对python文档这么熟悉