All permutations from 2 lists

Wed Mar 2 02:41:20 EST 2022

On 02/03/2022 01:32, Rob Cliffe via Python-list wrote:
> itertools.product returns an iterator (or iterable, I'm not sure of the
> correct technical term).

There's a simple test:
iter(x) is x --> True # iterator
iter(x) is x --> False # iterable
So:
 >>> from itertools import product
 >>> p = product("ab", [1, 2])
 >>> iter(p) is p # iterator
True
 >>> items = [1, 2] # iterable
 >>> iter(items) is items
False
Another interesting property of (finite) iterators/iterables
list(iterable) == list(iterable) --> Generally True, but not guaranteed.
a = list(iterator) # whatever
b = list(iterator) # [] (*)
(*) Kill the coder if that doesn't hold ;)