Remove common terms from two strings

Question

x=list(input()) 
y=list(input()) 
for a in x:
    if a in y:
        x.remove(a)
        y.remove(a)
print(x, y)

I can't get the exact answer for this code if I gave input like this

x = "lilly" 
y ="daliya"

The output must be

(l,l) (d, a, a)

But it is

(i, l, l) (d, a, i, a)

Possible duplicate of [Removing from a list while iterating over it](https://stackoverflow.com/questions/6500888/removing-from-a-list-while-iterating-over-it) — Patrick Haugh, May 02 '19 at 13:54
Possible duplicate of [Delete intersection between two lists](https://stackoverflow.com/questions/9331627/delete-intersection-between-two-lists) — Alex W, May 02 '19 at 13:57
Start using print statement as debugger by printing for x/y each a variable. Then you can see in which order things are handled and figure it out yourself. — ZF007, May 02 '19 at 14:06
You just need to iterate on a copy of x via `x[:]` and you should not get this error anymore, check my answer below @Kumaresh ! — Devesh Kumar Singh, May 02 '19 at 15:10

Devesh Kumar Singh · Answer 1 · 2019-05-02T14:24:29.953

2

Iterate on the copies of x, using list slicing arr[:] otherwise you are modifying the same list you are iterating on.

x=list('lilly')
y=list('daliya')
for a in x[:]:
    if a in y:
        x.remove(a)
        y.remove(a)
print(x, y)

The output will then be

['l', 'l'] ['d', 'a', 'a']

edited May 02 '19 at 14:24

answered May 02 '19 at 14:04

1 Answers1