比较2个文件并丢弃公共线 [英] Compare 2 files and discard common lines

问题描述

我需要比较2个文本文件并写入第3个文件

只显示在第2个文件中但不在第1个文件中的那些行。


而不是重新发明轮子我想知道是否有人已经写了

任何东西？

解决方案

5月29日下午6:36，loial< jldunn2 ... @ googlemail.comwrote：

我要求比较2个文本文件并写入第3个文件

只显示第2个文件中出现但第1个文件中没有的行。


而不是重新发明轮子我我想知道是否有人已经写过

了吗？

您可以使用cmp（x，y）函数判断字符串是否类似于

另一个。
< cmp（''spam''，''eggs''）将返回1（垃圾邮件大于鸡蛋）

（不知道为什么）

交换两个给-1

并且''egg''和''egg''给出0.


就是你的意思正在寻找？

Kalibr写道：

5月29日下午6:36，loial< jldunn2 ... @ googlemail.comwrote：

>我要求比较2个文本文件并写入第3个文件
只有那些那些行出现在第二个文件中但不出现在第一个文件中。

我不知道是否有人已经写过
任何东西而不是重新发明轮子？

您可以使用cmp（x，y）函数来判断字符串是否类似于

另一个字符串。

或==。


Stefan

< blockquote> loial写道：

我需要比较2个文本文件并写入第3个文件

只显示那些出现在第二个文件但不在第一个文件中。

lines_in_file2 = set（open（" file2"）。readlines（））

for line in open（" file1"） ：

如果行不在lines_in_file2中：

打印行


Stefan

I have a requirement to compare 2 text files and write to a 3rd file
only those lines that appear in the 2nd file but not in the 1st file.

Rather than re-invent the wheel I am wondering if anyone has written
anything already?

解决方案

On May 29, 6:36 pm, loial <[e-mail]:

I have a requirement to compare 2 text files and write to a 3rd file
only those lines that appear in the 2nd file but not in the 1st file.

Rather than re-invent the wheel I am wondering if anyone has written
anything already?

You can use the cmp(x, y) function to tell if a string is similar to
another.

going cmp(''spam'', ''eggs'') will return 1 (spam is greater than eggs)
(have no idea why)
swapping the two give -1
and having ''eggs'' and ''eggs'' gives 0.

is that what you were looking for?

Kalibr wrote:

On May 29, 6:36 pm, loial <[e-mail]:

>I have a requirement to compare 2 text files and write to a 3rd file
only those lines that appear in the 2nd file but not in the 1st file.

Rather than re-invent the wheel I am wondering if anyone has written
anything already?

You can use the cmp(x, y) function to tell if a string is similar to
another.

Or "==".

Stefan

loial wrote:

I have a requirement to compare 2 text files and write to a 3rd file
only those lines that appear in the 2nd file but not in the 1st file.

lines_in_file2 = set(open("file2").readlines())
for line in open("file1"):
if line not in lines_in_file2:
print line

Stefan

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