python program to Sort a list in ascending order

with inbuilt functions :

list1=[1,2,3]
list1.sort()

without inbuilt functions :

def sortlist(list):
    for i in range(len(list)):
        for j in range(len(list) - 1):
            if list[j] < list[j+1]:
                t=list[j]
                list[j]=list[j+1]
                list[j+1]=t
            

list1=[2,12,1,21,2,12,1,2]
sortlist(list1)
print list1