Search second largest

def second_largest(arr):
    
    largest = -1
    second_lar = -1
    
    for i in range(len(arr)):
        
        if arr[i] > largest:
            second_lar = largest
            largest = arr[i]
        
        elif arr[i] < largest and arr[i] > second_lar:
            second_lar = arr[i]
            
    print("largest", largest)
    print("second largest = ", second_lar)
    
arr= [12, 35, 1, 10, 34, 1]
second_largest(arr)