Python - 比较 2 个文件和输出差异

问题描述

我的目标是编写一个脚本来比较文件中的每一行，并根据这个比较，创建一个新文件，其中包含第二个文件中没有的文本行.

I'm aiming to write a script that will compare each line within a file, and based upon this comparison, create a new file containing the lines of text which aren't in the second file.

例如；

**File 1:** 

Bob:20 
Dan:50 
Brad:34 
Emma:32 
Anne:43

**File 2:**

Dan:50
Emma:32
Anne:43

新输出(文件 3):

Bob:20
Brad:34

我知道这需要如何完成，但不完全是:

I have some idea of how this needs to be done, but not exactly:

def compare(File1,File2):
   with open(File1, "a") as f1:
       lines = f1.readlines()
       string = line.split(':')
   with open(File2, "a") as f2:
       lines = f2.readlines()
       string2 = line.split(':')
       if string[0] == string[1]:
           with open("newfile2.txt", "w") as f3:
            ....

我想我需要一些类似的东西，然后比较每个文件每一行的字符串[0]，但从这一点上我真的一无所知.

I think I need something along the lines of this and then to compare the string[0] from each line of each file but I'm really clueless from this point.

我们非常欢迎任何帮助.

Any help would be extremely welcomed.

推荐答案

这对我有用:

def compare(File1,File2):
    with open(File1,'r') as f:
        d=set(f.readlines())


    with open(File2,'r') as f:
        e=set(f.readlines())

    open('file3.txt','w').close() #Create the file

    with open('file3.txt','a') as f:
        for line in list(d-e):
           f.write(line)

您需要比较 readlines 集并找出 file2 中不存在的行.然后，您可以将这些行附加到新文件中.

You need to compare the readlines set and find out lines that are not present in file2. You can then append these lines to the new file.

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