问题描述
我有两个列表.一个只是一个 id 列表
I have two lists. One is simply a list of ids
ids = [123, 124, 127, 316, 463]
另一个是 id 和名称的元组列表
and the other is a list of tuples of id's and names
combined = [(123, "Brian"), (124,"Eric"), (222,"Jane")]
对这些进行设置比较的最简单方法是什么?我需要找出两件事 - 第一个列表中存在的 id 没有出现在第二个列表中，特别是 127, 316, 463 ，反之亦然，这将是 (222, "简").
What is the easiest way to do set comparisons on these? I need to find out two things - ids that exist in the first list that don't appear in the second list, specifically 127, 316, 463 and vice versa, which would be (222, "Jane").
我使用的是 Python 2.5.
I am using Python 2.5.
推荐答案
首先，您至少应该升级到 Python 2.7，如果没有阻止您这样做的话.
First of all, you should upgrade to Python 2.7 at the very least, if something doesn't prevent you from doing so.
如果要比较数字，可以将 ids 与 combined 中每个列表的第一个元素进行比较:
You can compare ids to the first element of each list in combined if you want to compare the numbers:
ids = [123, 124, 127, 316, 463]
combined = [(123, "Brian"), (124,"Eric"), (222,"Jane")]
combined_first = [x[0] for x in combined]
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