如何从Python中的__init__返回值？ [英] How to return a value from __init__ in Python?

问题描述

我有一个类带有 __ init __ 函数。

I have a class with an __init__ function.

如何在创建对象时从此函数中返回整数值？

How can I return an integer value from this function when an object is created?

，其中 __ init __ 执行命令行解析，我需要设置一些值。是否设置它在全局变量和使用它在其他成员函数？如果是这样怎么办呢？到目前为止，我在类外声明了一个变量。并设置一个函数不反映在其他函数中

I wrote a program, where __init__ does command line parsing and I need to have some value set. Is it OK set it in global variable and use it in other member functions? If so how to do that? So far, I declared a variable outside class. and setting it one function doesn't reflect in other function ??

推荐答案

__ init __ 返回新创建的对象。您不能（或至少不应该）返回其他内容。

__init__ returns the newly created object. You cannot (or at least shouldn't) return something else.

尝试返回一个实例变量（或函数）。

Try making whatever you want to return an instance variable (or function).

>>> class Foo:
...     def __init__(self):
...         return 42
... 
>>> foo = Foo()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __init__() should return None

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