Imported script cannot resolve 'Key' constant --- needs: from sikuli import *

I have an imported script called blur.sikuli. When I run this on its own, I have no problems.

there is a line:

    type(Key.F5)

That I use to refresh the page.

If I import this script from another script (main.sikuli) in the same directory, it does not consider Key to be defined.

NameError: global name 'Key' is not defined

Is this a namespace issue? Seems like it should be safe to do without having to import all of my functions as global

Code:

blur.sikuli
---------------
def blurOperation():
    click("Blur")
    wait("Blur-1.png")
    click("1319653625110.png")

    assert exists("1319728623722.png")

def blur(self):
    type(Key.F5)
    wait("FIvnuwILHQCA.png")
    blurOperation()

#blur()

main.sikuli
----------------
import blur
blur.blur()