How to subtract two strings?

Question

I have a long string, which is basically a list like str=\"lamp, bag, mirror,\" (and other items)

I was wondering if I can add or subtract some items, i

Answer 1

If you have two strings like below:

t1 = 'how are you'
t2 = 'How is he'

and you want to subtract these two strings then you can use the below code:

l1 = t1.lower().split()
l2 = t2.lower().split()
s1 = ""
s2 = ""
for i in l1:
  if i not in l2:
    s1 = s1 + " " + i 
for j in l2:
  if j not in l1:
    s2 = s2 + " " + j 

new = s1 + " " + s2
print new

Output will be like:

are you is he