Is any() evaluated lazily?

Question

I am writing a script in which i have to test numbers against a number of conditions. If any of the conditions are met i want to return True an

Answer 1

While the all() and any() functions short-circuit on the first "true" element of an iterable, the iterable itself may be constructed in a non-lazy way. Consider this example:

>> any(x == 100 for x in range(10**8))
True

This will take several seconds to execute in Python 2 as range(10**8) constructs a list of 10**8 elements. The same expression runs instantly in Python 3, where range() is lazy.