python函数返回函数 [英] python functions returning functions

问题描述

我知道 functools 中的 partial 函数，但是在一般的python程序(不包括:Haskell，Erlang，Clojure等)中，将函数编写为返回Python中的函数?

I am aware of the partial function in functools, but how common is it in general python programs (not: Haskell, Erlang, Clojure etc ) to write functions to return functions in Python?

例如:

>>> def returnfunk(xs):
...     return lambda x: list(filter(lambda y: x == y, xs))
... 
>>> fn = returnfunk(["cat", "dog", "horse"])
>>> 
>>> (fn("cow") == []) == True
True
>>> (fn("cat") == ['cat']) == True
True
>>> 
>>> list(filter(fn, ["zebra", "elephant", "dog", "parrot", "cat"]))
['dog', 'cat']

它是针对真实(python)世界还是出于爱好，学术和兴趣的更多目标?

is it meant for the real (python) world or more for hobby, academic, interest?

推荐答案

修饰符 @classmethod 和 @staticmethod 是两个示例.

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