looking for ways to get diff between two txt files

Hi,

I would really appreciate if someone help to find a way to calculate
delta (diff) between two similar text files. I have looked at difflib
and found related script at this site
http://www.java2s.com/Code/Python/Utility/Printfilediffsincontextunifiedorndiffformats.htm

Is there a simple way to just get delta between two files? e.g. I have
below two files and the delta between these two files is in
diff_output.txt

file1.txt
hello world

file2.txt
hello world
hello python

diff_output.txt
hello python

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Thanks,
Kamal
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