How to check if a list contains duplicate items?

Question

I want to validate a list to make sure that there are no duplicate items. My problem is that I don't know how to do this in the if statement. Is there a method or something in python that will return False if there are duplicates in the list?

Here is what I had in mind:

lst = ["1","2","3","3","4"]

if #lst contains no duplicates :
    print("success")
else:
    print("duplicate found")

Thanks in advance.

Answer 1

As said by Jkdc, convert it to a set and compare the length

lst = ["1","2","3","3","4"]

if len(set(lst)) == len(lst):
    print("success")
else:
    print("duplicate found")