How to compute a delta: the difference between lists of strings

[J. Mwebaze]

This is out of curiosity, i know this can be done with python diffllib
module, but been figuring out how to compute the delta, Consider two lists
below.

s1 = ['e', 'f', 'g', 'A', 'B', 'C', 'D', 'C']
s2 =['e', 'A', 'B', 'f', 'g', 'C', 'D', 'z']

This is the result should be

['  e', '+ A', '+ B', '  f', '  g', '- A', '- B', '  C', '  D', '- C', '+
z']

ideas on how to approach this.. ?

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