检查两个列表是否共享至少一个元素 [英] Checking if two lists share at least one element

问题描述

例如，我有两个列表:

a = ["mail1", "mail2", "mail3", "mail4"]
b = ["mail2", "mail5"]

，我想检查列表b中的任何元素是否也出现在列表a中.

and I want to check if any of the elements in list b also appears in list a.

我想知道是否有一种方法(及其作用)没有for循环.

I wanted to know if there is a way (and what is it) to do this without a for loop.

我还想知道如何创建一个布尔值列表，其中每个值都是值a[i]和b[i]的比较结果，例如:

Also I wanted to know how can I create a list of boolean values, where each value will be the result of the comparison of values a[i] and b[i], something like:

[z for i, j in zip(a, b)  z = i == j] # (just with the right syntax)

如果在某些地方i == j，

z将为1，因此我可以检查数组中是否有任何'True'值.

z will be 1 if in some place i == j, so I can check the array for any 'True' values.

推荐答案

您可以使用any:

any(x in a for x in b)

关于此生成器表达式的好处是，any将在生成器生成True后立即返回True，即不会有多余的x in a查找.

The nice thing about this generator expression is that any will return True as soon as the generator yields a True, i.e. there won't be redundant x in a lookups.

关于您的新问题:

[x == y for x,y in zip(a,b)]

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