python - Comprehension for flattening a sequence of sequences?

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/457215/comprehension-for-flattening-a-sequence-of-sequences

Answer 1

With a comprehension? Well...

>>> seq = '012345'
>>> swapped_pairs = zip(seq[1::2], seq[::2])
>>> ''.join(item for pair in swapped_pairs for item in pair)
'103254'