January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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第 4 章 物件導向的 Python
__rdivmod__ __rdivmod_ _(self,other)
內建函式
divmod(y,x)
會在
y
沒有
__divmod_ _
，或該方法回傳
NotImplemented
的時候呼叫
x.__rdivmod_ _(y)
。
__rdivmod_ _
應該回傳一
個對組
(remainder,quotient)
。
__rpow__ __rpow_ _(self,other)
y**x
與
pow(y,x)
會在
y
沒有
__pow_ _
，或該方法回傳
NotImplemented
的
時候呼叫
x.__rpow_ _(y)
。這種情況中沒有三個引數的形式。
裝飾器
在 Python 中，你經常會使用所謂的
高階函式
（
higher-order functions
），也
就是接受一個函式作為引數，並回傳一個函式作為它們結果的 callables。
舉例來說，涵蓋於前面的「類別層級方法」中的描述器型別
staticmethod
與
classmethod
，可在類別主體中被這樣使用：
def f(cls, ...):
... 省略 f 的定義 ...
f = classmethod(f)
然而，在
def
述句
之後
才出現對
classmethod
的呼叫會減低程式碼的可讀
性：閱讀
f
的定義時，程式碼的讀者尚未察覺
f
將會成為一個類別方法，
而非一個實體方法。如果提及
classmethod
的地方出現在
def
之前
，而非
之後
，程式碼會更易讀。為此，就使用稱作
裝飾器
（
decoration
）的語法：
@classmethod ...
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