Python Insertion Sort

>>> list2
[5, 5, 5, 5, 5, 4, 4, 2, 1]
>>> def insertion_sort(list2):
...     for index in range(1,len(list2)):
...             position=index
...             currentvalue=list2[index]
...             while position>0 and currentvalue<list2[position-1]:
...                     list2[position]=list2[position-1]
...                     list2[position-1]=currentvalue
...                     position-=1
... 
>>> insertion_sort(list2)
>>> list2
[1, 2, 4, 4, 5, 5, 5, 5, 5]