如果只希望b中的第一个匹配项:

If you only want the first match in b:

next((s for s in b if s in a), None)

这样做的好处是，一旦找到匹配项，就会将其短路，而其他列表解决方案将继续保持下去.如果找不到匹配项，它将返回None.

This has the advantage of short-circuiting as soon as it finds a match whereas the other list solutions will keep going. If no match is found, it will return None.