On: Anti-Patterns in Python Programming

[YokoZar]

Wouldn't chain(*words) require unpacking all of words before feeding it into the chain function, storing a second copy of the word list in memory?

[rbonvall → YokoZar]

Yes it would, but I don't care about these small efficiencies, say 97% of the time ;)

The lazy version in Python 3 would be this one:

    list(chain(*map(iter, words)))

For Python 2 one has to use itertools.imap instead of map.