Comparing two text files in python

Question

I need to compare two files and redirect the different lines to third file. I know using diff command i can get the difference . But, is there any way of doing it in python ? An

Answer 1

#compare 2 text files.

test1filehandle = open("test1.txt", "r") #creating a file handle
test2filehandle=open("test2.txt","r") #creating a file handle to read
test3filehandle=open("test3.txt","w") #creating a file handle to write
test1list= test1filehandle.readlines() #read the lines and store in the list
test2list=test2filehandle.readlines()
k=1
for i,j in zip(test1list,test2list): #zip is used to iterate the variablea in 2 lists simultaneoously   
    if i !=j:
        test3filehandle.write("Line Number:" +str(k)+' ')
        test3filehandle.write(i.rstrip("\n") + ' '+ j)
    k=int(k)
    k=k+1;