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Reverse a part (slice) of a list

March 21, 2012 Leave a comment

Problem
You have a list and you want to reverse a part (slice) of it.

Solution
Let our list be [1,2,9,6,5] and say we want to reverse its end from element 9, i.e. we want to get [1,2,5,6,9].

a = [1,2,9,6,5]
i = 2    # reverse from this index position
j = 4    # reverse until this index position (included)
a[i:j+1] = reversed(a[i:j+1])
print a    # [1, 2, 5, 6, 9]
Categories: python Tags: ,