计算类的实例? [英] Counting instances of a class?

问题描述

我一直在从我正在扩展的模块中清理一些代码，但我似乎找不到一种方法来 Pythonify 这段代码:

I've been cleaning up some code from a module I'm extending and I can't seem to find a way to Pythonify this code:

global_next_id = 1

class Obj:
  def __init__(self):
    global global_next_id
    self.id = global_next_id

    global_next_id += 1

此代码使用全局 id 来跟踪类的实例(我在内部也需要变量 self.id，它需要是一个数字).

This code uses a global id to keep track of instances of a class (I need the variable self.id internally as well, and it needs to be a number).

谁能建议一种方法来 Pythonify 这段代码?

Can anyone suggest a way to Pythonify this code?

推荐答案

试试这个:

from itertools import count

class Obj(object):
  _ids = count(0)

  def __init__(self):
    self.id = next(self._ids)

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