Python: create dictionary using dict() with integer keys?

Question

In Python, I see people creating dictionaries like this:

d = dict( one = 1, two = 2, three = 3 )

What if my keys are integers? When I try this:

Answer 1

There are also these 'ways':

>>> dict.fromkeys(range(1, 4))
{1: None, 2: None, 3: None}
>>> dict(zip(range(1, 4), range(1, 4)))
{1: 1, 2: 2, 3: 3}