Python Second Runner Up Algorithm

secondrunnerup.py

if __name__ == '__main__':
    n = int(input())
    arr = map(int, input().split())
    
   # Convert the arr variable to a list
    a = list(arr)
    
    # a = [2, 4, 5, 2]
    
    # Select the first item in the
    # mx1 = 2
    # mn = 2
    mx1=a[0]
    mn=a[0]
    
    # loop through each item in list
    for i in a:
        # if the current item is larger than the first item replace the variable
        # assume i is 2 
        # mx1 would be still be 2 as i is not greater than 2
        # but if i is 2
        # mx1 would be replaced to 4
        if(i > mx1):
            mx1 = i
        # if the current item is less than the first item replace the varible
        # if the current item is 4 and mn = 2 thus mn remain 2 
        if(i < mn):
            mn = i
    # assing mx2 to the lowest
    mx2 = mn
    
    for i in a :
        if(i > mx2 and i < mx1):
            mx2 = i
    print(mx2)