python对比两个文件的方法

如果想要对比两个txt文件，a比b多了哪些文件，就用下面的代码

import sys

f1, f2=None,None
try:
f1=open("pro1.txt", "r")
m=f1.readlines()
except IOError:
print "pro.txt does not exist!"
sys.exit(2)
finally:
if f1:
f1.close()
# reead lines from mids2.txt
try:
f2=open("pro.txt", "r")
n=f2.readlines()
except IOError:
print "pro1.txt does not exist!"
sys.exit(2)
finally:
if f2:
f2.close()
#filter
for a in m:
for b in n:
if a==b:
n.remove(b)

for i in range(len(n)):
n[i]=n[i].strip()
#print n
#print " ".join(n)
for aar in n:
with open("baidu.txt","a") as fe:
fe.write(aar+"\n")

这样就把多出来的文件写入到baidu.txt，大家可以试试