問題描述
Python 內置的 coerce 函數有哪些常見用途?如果我不知道數值 type ，我可以看到應用它"noreferrer">根據文檔，但是否存在其他常見用法?我猜想在執行算術計算時也會調用 coerce()，例如 x = 1.0 +2.它是一個內置函數，所以大概它有一些潛在的常見用法?
What are common uses for Python's built-in coerce function? I can see applying it if I do not know the type of a numeric value as per the documentation, but do other common usages exist? I would guess that coerce() is also called when performing arithmetic computations, e.g. x = 1.0 +2. It's a built-in function, so presumably it has some potential common usage?
推薦答案
它是 早期的python，它基本上使一個數字元組成為相同的底層數字類型，例如
Its a left over from early python, it basically makes a tuple of numbers to be the same underlying number type e.g.
>>> type(10)
<type 'int'>
>>> type(10.0101010)
<type 'float'>
>>> nums = coerce(10, 10.001010)
>>> type(nums[0])
<type 'float'>
>>> type(nums[1])
<type 'float'>
這也是為了讓對象在舊類中表現得像數字
(在這里使用它的一個不好的例子是......)
It is also to allow objects to act like numbers with old classes
(a bad example of its usage here would be ...)
>>> class bad:
... """ Dont do this, even if coerce was a good idea this simply
... makes itself int ignoring type of other ! """
... def __init__(self, s):
... self.s = s
... def __coerce__(self, other):
... return (other, int(self.s))
...
>>> coerce(10, bad("102"))
(102, 10)
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