check if list contains duplicates python code example

Example 1: python has duplicates

def has_duplicates(lst):
    return len(lst) != len(set(lst))
    
x = [1,2,3,4,5,5]
has_duplicates(x) 			# True

Example 2: how to check if there are duplicates in a list python

>>> your_list = ['one', 'two', 'one']
>>> len(your_list) != len(set(your_list))
True

Example 3: python check for duplicate

def checkDuplicate(user):
    if len(set(user)) < len(user):
        return True
    return False