[Python] python tkinter - detecting arrow keys when an alternate key is pressed

I am using python and tkinter, and wish to capture if an arrow key is pressed, when one of the alternate keys is down.

I have the following working, for detecting shift, or control, but I can't figure out what the the mask needs to be for detecting if an alternate key is down when an arrow key is pressed.

if event.keysym == 'space':
print("space bar")

if event.state & 0x0001: # shift key
if event.keysym == 'Down':
print("shift and down arrow")
elif event.keysym == 'Up':
print("shift and up arrow")
elif event.keysym == 'Left':
print("shift and left arrow")
elif event.keysym == 'Right':
print("shift and right arrow")

elif event.state & 0x0004: # control key
if event.keysym == 'Down':
print("control and down arrow")
elif event.keysym == 'Up':
print("control and up arrow")
elif event.keysym == 'Left':
print("control and left arrow")
elif event.keysym == 'Right':
print("control and right arrow")

elif event.state & 0x????: # alternate key --- 0x????
if event.keysym == 'Down':
print("alternate and down arrow")
elif event.keysym == 'Up':
print("alternate and up arrow")
elif event.keysym == 'Left':
print("alternate and left arrow")
elif event.keysym == 'Right':
print("alternate and right arrow")

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