Question

How is that i get the reverse iteration using the following code. Should I be using the reduce function or something?

Example:

for i in range(4):
    print i ////0 1 2 3

how do i print the same in the reverse order

3 2 1 0

a=[5,2,1,4,3]

I also want to print the above array in reverse using the index and not a[::-1]
i.e,i want to first print

 a[4] //get index starting from last how to achieve this
 a[3]
 a[2]
 a[1]
 a[0]

Answer 1

Use the reversed function:

for i in reversed(range(4)):
    print i

prints:

3
2
1
0

and

a=[5,2,1,4,3]
for i in reversed(a):
    print i

prints

3
4
1
2
5