如何在文本文件中找到重复的行并打印它们?

问题描述

我有一个包含大约 1,200 行的文本文件.其中一些是重复的.

I have a text file with some 1,200 rows. Some of them are duplicates.

如何在文件中找到重复的行(但不担心大小写)，然后在屏幕上打印出该行的文本，以便我可以找到它?我不想删除它们或任何东西，只需找出它们可能是哪些行即可.

How could I find the duplicate lines in the file (but not worrying about case) and then print out the line's text on the screen, so I can go off and find it? I don't want to delete them or anything, just find which lines they might be.

推荐答案

这很容易使用:

with open('file') as f:
    seen = set()
    for line in f:
        line_lower = line.lower()
        if line_lower in seen:
            print(line)
        else:
            seen.add(line_lower)

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