Python中强制转换和强制转换有什么区别? [英] What's the difference between casting and coercion in Python?

问题描述

在Python文档和邮件列表中，我看到值有时是强制转换"的，有时是强制的"的.

In the Python documentation and on mailing lists I see that values are sometimes "cast", and sometimes "coerced".

推荐答案

我认为"casting"不应该用于Python.仅存在类型转换，而没有强制转换(在C意义上).完成类型转换，例如通过 int(o)将对象o转换为整数(实际上，一个整数对象是从o构造的).强制操作在二进制操作的情况下发生:如果您执行 x + y ，并且x和y具有不同的类型，则在执行操作之前将它们强制转换为单一类型.在2.x中，特殊的方法 __ coerce __ 允许对象控制其强制.

I think "casting" shouldn't be used for Python; there are only type conversion, but no casts (in the C sense). A type conversion is done e.g. through int(o) where the object o is converted into an integer (actually, an integer object is constructed out of o). Coercion happens in the case of binary operations: if you do x+y, and x and y have different types, they are coerced into a single type before performing the operation. In 2.x, a special method __coerce__ allows object to control their coercion.

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