Сравнение содержания двух текстовых файлов

import difflib
 
file1 = open('D:\\jtag\\bsdl\\for new ISA\\final_result.txt', 'r')#tyt nado ykazuvat to chto nakhoditsa pod somneniem
file2 = open('D:\\jtag\\bsdl\\for new ISA\\final_result after fast test.txt', 'r')#tyt etalon
 
diff = difflib.ndiff(file1.readlines(), file2.readlines())
delta = ''.join(x for x in diff if x.startswith('- '))
 
f = open('D:\\jtag\\bsdl\\for new ISA\\difference.txt','w')
f.write(delta)
f.close()
 
print (delta)

>>> def read_words(words_file):
...     return sorted([word for line in open(words_file, 'r') for word in line.split()])
...
>>> def diff_files(f1, f2):
...     return "same" if read_words(f1) == read_words(f2) else "different"
...
>>> diff_files("f1.txt", "f2.txt")
'same'
>>> diff_files("f1.txt", "f3.txt")
'different'
>>>

data = [set(open(i).read().split()) for i in ('123.txt', '12.txt')]
print(data[0] == data[1])

data = [set(open(i).read().split()) for i in ('123.txt', '12.txt')]
print(data[0].difference(data[1]))

data = [set(open(i).read().split()) for i in ('123.txt', '12.txt')]
diff = data[0].difference(data[1])
if diff:
    print(diff)
else:
    print('Нет различий')

f.write(' '.join(diff))