Python：如何计算创建的对象数量？ [英] Python: How to count the number of objects created?

问题描述

我是Python的新手。我的问题是，计算python对象数量以跟踪在任何给定时间存在的对象数量的最佳方法是什么？我想到要使用静态变量。

I'm new to Python. My question is, what is the best way to count the number of python objects for keeping track of number of objects exist at any given time? I thought of using a static variable.

我已经阅读了几个Q&关于Python的静态变量，但是我无法弄清楚如何使用静态变量来实现对象计数。

I have read several Q & A on static variables of Python, but I could not figure out how I could achieve object counting using statics.

我的尝试是这样的（如下），来自C ++背景我原以为这会成功，但没有成功。我不是 iMenuNumber 的静态成员，并且每次创建对象时它应该增加吗？

My attempt was like this(below), from my C++ background I was expecting this to work but it didn't. Iis not iMenuNumber a static member and it should get incremented every time an object is created?

class baseMENUS:
    """A class used to display a Menu"""

    iMenuNumber = 0

    def __init__ (self, iSize):
        self.iMenuNumber = self.iMenuNumber + 1
        self.iMenuSize = iSize

def main():
   objAutoTester = baseMENUS(MENU_SIZE_1)
   ....
   ....
   ....
   objRunATest = baseMENUS(MENU_SIZE_2)

我还没有编写delete（ del ）函数（析构函数）。

I'm yet to write the delete(del) function(destructor).

推荐答案

使用 self .__ class __。iMenuNumber 或 baseMENUS.iMenuNumber 代替 self.iMenuNumber 可以在类而不是实例上设置var。

Use self.__class__.iMenuNumber or baseMENUS.iMenuNumber instead of self.iMenuNumber to set the var on the class instead of the instance.

此外，匈牙利表示法不是pythonic（实际上，它会以各种语言显示）-您可能要停止使用它。参见 http://www.python.org/dev/peps/pep-0008/ 获得一些代码样式建议。

Additionally, Hungarian Notation is not pythonic (actually, it sucks in all languages) - you might want to stop using it. See http://www.python.org/dev/peps/pep-0008/ for some code style suggestions.

这篇关于Python：如何计算创建的对象数量？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！