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# Define a function, arr is the array, n is the length of the array, which is an optional parameter and not used here
def _sum(arr, n): 

    # Use the built-in sum function to calculate
    return(sum(arr)) 

# Call the function
arr = [] 
# Array elements
arr = [12, 3, 4, 15] 

# Calculate the length of the array
n = len(arr) 

ans = _sum(arr, n) 

# Output the result
print('The sum of array elements is', ans)

The sum of array elements is 34