How to reverse tuples in Python?
iteration, loops, python, tuples
Solution
There are two idiomatic ways to do this:
reversed(x) # returns an iterator
or
x[::-1] # returns a new tuple
Since tuples are immutable, there is no way to reverse a tuple in-place.
Edit: Building on @lvc's comment, the iterator returned by `reversed` would be equivalent to
def myreversed(seq):
for i in range(len(x) - 1, -1, -1):
yield seq[i]
i.e. it relies on the sequence having a known length to avoid having to actually reverse the tuple.
As to which is more efficient, i'd suspect it'd be the `seq[::-1]` if you are using all of it and the tuple is small, and `reversed` when the tuple is large, but performance in python is often surprising so measure it!
Problem
Is this possible? Doesn't have to be in place, just looking for a way to reverse a tuple so I can iterate on it backwards.