Python - getting just the difference between strings

Question

What\'s the best way of getting just the difference from two multiline strings?

a = \'testing this is working \\n testing this is working 1 \\n\'
b = \'testi         


        

Answer 1

a = 'testing this is working \n testing this is working 1 \n'
b = 'testing this is working \n testing this is working 1 \n testing this is working 2'

splitA = set(a.split("\n"))
splitB = set(b.split("\n"))

diff = splitB.difference(splitA)
diff = ", ".join(diff)  # ' testing this is working 2, more things if there were...'

Essentially making each string a set of lines, and taking the set difference - i.e. All things in B that are not in A. Then taking that result and joining it all into one string.

Edit: This is a conveluded way of saying what @ShreyasG said - [x for x if x not in y]...