How to compare two files in python

If you want to compare two txt files, which files a has more than b, use the following code

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")

In this way, the extra files will be written to baidu.txt, you can try