mylist = [7, 3, 9, 12, 11]

​

n = len(mylist)

for i in range(n-1):

  swapped = False

  for j in range(n-i-1):

    if mylist[j] > mylist[j+1]:

      mylist[j], mylist[j+1] = mylist[j+1], mylist[j]

      swapped = True

  if not swapped:

    break

​

print(mylist)

​