Does Python evaluate if's conditions lazily? [duplicate]

Answer 1

A short demo would be to compare the time difference between

all(xrange(1,1000000000))

and

any(xrange(1,1000000000))

The all() has to check every single value, whilst the any() can give up after the first True has been found. The xrange, being a generator, therefore also gives up generating things as soon as the evaluator is done. For this reason, the all will consume large amounts of RAM and take ages, whilst the any will use just a few bytes and return instantaneously.