Python中的元组声明 [英] Tuple declaration in Python

问题描述

在python中，可以这样显式地声明一个带有括号的元组:

In python, one can declare a tuple explicitly with parenthesis as such:

>>> x = (0.25, 0.25, 0.25, 0.25)
>>> x
(0.25, 0.25, 0.25, 0.25)
>>> type(x)
<type 'tuple'>

或者，不带括号，python自动将其打包成一个不可变的元组:

Alternatively, without parenthesis, python automatically packs its into a immutable tuple:

>>> x = 0.25, 0.25, 0.25, 0.25
>>> x
(0.25, 0.25, 0.25, 0.25)
>>> type(x)
<type 'tuple'>

是否存在用于声明元组的pythonic样式?如果是，请同时参考相关的PEP或链接.

Is there a pythonic style to declare a tuple? If so, please also reference the relevant PEP or link.

实现元组的最终产品"没有区别，但是在带括号和不带括号的元组的初始化方式(在CPython中)是否有区别?

There's no difference in the "end-product" of achieving the tuple but is there a difference in how the tuple with and without parenthesis are initialized (in CPython)?

推荐答案

从实际的角度来看，最好始终使用括号，因为它有助于提高代码的可读性.正如 import之一所说:

From practical point of view it's best to always use parenthesis as it contributes to readability of your code. As one of the import this moto says:

显式比隐式更好."

"Explicit is better then implicit."

还请记住，在定义一个元组时，您需要使用逗号: one_tuple =(15，).

Also remember, that when defining one-tuple you need a comma: one_tuple = (15, ).

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