How do I reverse a sublist in a list in place?

Question

I\'m supposed to create a function, which input is a list and two numbers, the function reverses the sublist which its place is indicated by the two numbers. for example this is

Answer 1

Just use a slice:

>>> lst = [1, 2, 3, 4, 5] 
>>> lst[0:len(lst[3::-1])]=lst[3::-1]
>>> lst
[4, 3, 2, 1, 5]

Or, perhaps easier to understand:

>>> lst = [1, 2, 3, 4, 5] 
>>> sl=lst[3::-1]
>>> lst[0:len(sl)]=sl
>>> lst
[4, 3, 2, 1, 5]