Python将多个变量初始化为同一个初始值 [英] Python initialize multiple variables to the same initial value

问题描述

我已经解决了这些问题，

<块引用>

1. Python 将多个变量分配给相同的值?列出行为
   关于元组，我只想变量可以是字符串、整数或字典
2. 更优雅的多变量声明方式同时
   这个问题有一些我想问的，但接受的答案非常复杂

所以我正在努力实现，

我声明了这个变量，我想把这个声明减少到尽可能少的代码行.

details = Noneproduct_base = 无product_identity = 无category_string = 无store_id = 无image_hash = 无image_link_mask = 无结果 = 无中止 = 错误数据 = {}

什么是最简单、易于维护的?

解决方案

我同意其他答案，但想在这里解释一下重点.

None 对象是单例对象.将 None 对象分配给变量多少次，使用了相同的对象.所以

x = 无y = 无

等于

x = y = 无

但是你不应该对 python 中的任何其他对象做同样的事情.例如，

x = {} # 每次创建一个dict对象y = {}

不等于

x = y = {} # 分配给 x ,y 的相同 dict 对象.我们不应该这样做.

I have gone through these questions,

1. Python assigning multiple variables to same value? list behavior
   concerned with tuples, I want just variables may be a string, integer or dictionary
2. More elegant way of declaring multiple variables at the same time
   The question has something I want to ask, but the accepted answer is much complex

so what I'm trying to achieve,

I have this variables declared, and I want to reduce this declarations to as less line of code as possible.

details = None
product_base = None
product_identity = None
category_string = None
store_id = None
image_hash = None
image_link_mask = None
results = None
abort = False
data = {}

What is the simplest, easy to maintain ?

解决方案

I agree with the other answers but would like to explain the important point here.

None object is singleton object. How many times you assign None object to a variable, same object is used. So

x = None
y = None

is equal to

x = y = None

but you should not do the same thing with any other object in python. For example,

x = {}  # each time a dict object is created
y = {}

is not equal to

x = y = {}  # same dict object assigned to x ,y. We should not do this.

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