[Python] Can't raise an exception with user input

I want to raise an exception in this bit of code when the user enters a choice that's not in my 3 specified choices:

inventory = []
print "You can choose 2 items from the following:"
print "Gun, Grenade, Smoke bomb. Type your weapon choices now: "

try:
choice1 = raw_input("Choice 1: ")
inventory.append(choice1)

except:
if choice1 not in ('gun', 'grenade', 'smoke bomb'):
raise Exception("Please enter one of the 3 choices only only")


However, when I run it, the users choice will be accepted no matter what they type in and I'm not clear why.

I know I can make this work with other ways such as putting a while loop after the raw_input to check what was entered against those 3 items but I want to do this with try and except.

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