the largest number in a list

#finding the largest number in a list
my_list = [5,9,5,8,1,3]

def pop_sort(sorted):

    for _ in range(len(sorted) - 1):
        if sorted[0] < sorted[-1]:
            sorted[0]= sorted[-1]
        sorted.pop()
pop_sort(my_list)
print (my_list)