Python Reverse Generator

Asked 2009-10-13T16:04:24.747

I'm looking for a way to reverse a generator object. I know how to reverse sequences:

foo = imap(seq.__getitem__, xrange(len(seq)-1, -1, -1))

But is something similar possible with a generator as the input and a reversed generator as the output (len(seq) stays the same, so the value from the original sequence can be used)?

python generator reverse

Edit Report

1 Answer

reversed(list(input_generator)) is probably the easiest way.

There's no way to get a generator's values in "reverse" order without gathering all of them into a sequence first, because generating the second item could very well rely on the first having been generated.

answered 2009-10-13T16:13:18.123

Python Reverse Generator

1 Answer

Your Answer