为什么 Python 中没有元组理解?

2022-01-19 00:00:00 python list-comprehension tuples dictionary-comprehension set-comprehension

问题描述

众所周知，有列表推导式，比如

As we all know, there's list comprehension, like

[i for i in [1, 2, 3, 4]]

还有字典理解，比如

{i:j for i, j in {1: 'a', 2: 'b'}.items()}

但是

(i for i in (1, 2, 3))

将在生成器中结束，而不是 tuple 理解.这是为什么呢?

will end up in a generator, not a tuple comprehension. Why is that?

我的猜测是 tuple 是不可变的，但这似乎不是答案.

My guess is that a tuple is immutable, but this does not seem to be the answer.

解决方案

你可以使用生成器表达式:

You can use a generator expression:

tuple(i for i in (1, 2, 3))

但括号已经用于...生成器表达式.

but parentheses were already taken for … generator expressions.

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