Python-比较2个文件和输出差异 [英] Python - Compare 2 files and output differences
问题描述
我的目标是编写一个脚本,该脚本将比较文件中的每一行,并基于此比较,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
我对如何完成此操作有一些想法,但不完全是这样:
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:
....
我认为我需要一些类似的内容,然后才能比较每个文件的每一行中的字符串[0],但从这一点上我真的很无知.
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.
任何帮助都将受到极大的欢迎.
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)
您需要比较读取行集并找出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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