30-seconds-of-code/snippets/all_unique.md

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
Check if list has no duplicates	list,beginner	2018-04-01T11:03:09+03:00	2021-01-07T23:30:28+02:00

Checks if all the values in a list are unique.

• Use set() on the given list to keep only unique occurrences.
• Use len() to compare the length of the unique values to the original list.

def all_unique(lst):
  return len(lst) == len(set(lst))

x = [1, 2, 3, 4, 5, 6]
y = [1, 2, 2, 3, 4, 5]
all_unique(x) # True
all_unique(y) # False