如果每个元组中的第二个项目是重复的，我如何从元组列表中删除元素？

问题描述

如果每个元组中的第二个项目是重复的，我如何从元组列表中删除元素？

How do I remove element from a list of tuple if the 2nd item in each tuple is a duplicate?

例如，我有一个按第1个元素排序的列表看起来像这样：

For example, I have a list sorted by 1st element that looks like this:

alist = [(0.7897897,'this is a foo bar sentence'),
(0.653234, 'this is a foo bar sentence'),
(0.353234, 'this is a foo bar sentence'),
(0.325345, 'this is not really a foo bar'),
(0.323234, 'this is a foo bar sentence'),]

所需的输出离开元组最高的第一个项目应该是：

The desired output leave the tuple with the highest 1st item, should be:

alist = [(0.7897897,'this is a foo bar sentence'),
(0.325345, 'this is not really a foo bar')]

推荐答案

如果您的 alist 已经按第一个元素从最高到最低排序：

If your alist is already sorted by the first element from highest to lowest:

alist = [(0.7897897,'this is a foo bar sentence'),
(0.653234, 'this is a foo bar sentence'),
(0.353234, 'this is a foo bar sentence'),
(0.325345, 'this is not really a foo bar'),
(0.323234, 'this is a foo bar sentence'),]

seen = set()
out = []
for a,b in alist:
    if b not in seen:
        out.append((a,b))
        seen.add(b)

现在是：

out is now:

[(0.7897897, 'this is a foo bar sentence'),
 (0.325345, 'this is not really a foo bar')]

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