检查项目是否在嵌套列表中 [英] Check if an item is in a nested list

问题描述

在简单检查后的简单列表中很简单:

in a simple list following check is trivial:

x = [1, 2, 3]

2 in x  -> True

，但如果是列表列表，例如:

but if it is a list of list, such as:

x = [[1, 2, 3], [2, 3, 4]]

2 in x   -> False

如何解决此问题以便返回True?

how can this be addressed in order to return True?

推荐答案

使用内置的 any 函数.这是最惯用的解决方案，它也是有效的，因为any会在找到第一个匹配项后立即短路并停止:

Try this, using the built-in any function. It's the most idiomatic solution, and it's also efficient, because any short-circuits and stops as soon as it finds the first match:

x = [[1, 2, 3], [2, 3, 4]]
any(2 in sl for sl in x)
=> True

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