python compare two text files are the same

import difflib

A = open('./file/file01.txt', 'r')

B = open('./file/file02.txt', 'r')

contextA = A.read()

contextB = B.read()

s = difflib.SequenceMatcher(lambda x:x=="", contextA, contextB)

result = s.get_opcodes()

for tag, i1, i2, j1, j2 in result:
    print("%s contextA[%d:%d]=%s \ncontextB[%d:%d]=%s"%\
         (tag, i1, i2, contextA[i1:i2], j1, j2, contextB[j1:j2]))
         
equal contextA[0:24]=i love apple
i like bann 
contextB[0:24]=i love apple
i like bann
delete contextA[24:25]=a 
contextB[24:24]=

file01.txt

i love apple
i like banna

file02.txt

i love apple
i like bann