什么时候在Python中初始化类变量？ [英] When is a class variable initialized in Python?

问题描述

考虑以下Python 3代码：

Consider the following Python 3 code:

class A:
    b = LongRunningFunctionWithSideEffects()

何时会调用 LongRunningFunctionWithSideEffects（）？目前该模块已导入？还是目前以某种方式首次使用该类？

When will LongRunningFunctionWithSideEffects() be called? At the moment the module is imported? Or at the moment the class is first used in some way?

推荐答案

此刻该模块已导入

test.py ：

def x():
    print('x')

class A:
    x = x()

然后

Python 3.6.7 (default, Oct 22 2018, 11:32:17) 
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import test
x

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