assert type([]) == type(())

[VanceE]

Just curious.

type([]) == type(())
is False as expected

and 

assert type([]) == type(())
throws an AssertionError as expected.

However the following is not an error

for x in []:
    assert type(x) == type(())

I expected an AssertionError but get no errors at all.
Any explaination?

BTW I'm using Python2.5 and tried
type(None) == type(())
which is False as expected.

TIA