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Python: Find whether a given array of integers contains any duplicate element

Python: Array Exercise-14 with Solution

Write a Python program to find whether a given array of integers contains any duplicate element. Return true if any value appears at least twice in the said array and return false if every element is distinct.

Sample Solution:

Python Code :

def test_duplicate(array_nums):
    nums_set = set(array_nums)    
    return len(array_nums) != len(nums_set)     
print(test_duplicate([1,2,3,4,5]))
print(test_duplicate([1,2,3,4, 4]))
print(test_duplicate([1,1,2,2,3,3,4,4,5]))

Sample Output:

False
True
True

Python Code Editor:

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Python: Membership Testing in a Collection

>>> a = ('one', 'two', 'three', 'four', 'five')
>>> if 'one' in a:
...     print('The tuple contains one.')
... 
The tuple contains one.
>>> b = {0: 'zero', 1: 'one', 2: 'two', 3: 'three'}
>>> if 2 in b.keys():
...     print('The dict has the key of 2.')
... 
The dict has the key of 2.