30-seconds-of-code/snippets/has-duplicates.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Check for duplicates in list	list	jars-on-shelf-2	2018-04-01T11:03:09+03:00	2020-11-02T19:28:05+02:00

Checks if there are duplicate values in a flat list.

• Use set() on the given list to remove duplicates, compare its length with the length of the list.

def has_duplicates(lst):
  return len(lst) != len(set(lst))

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