How to update an existing entity ?

I used db.Expando, but I tried with db.model also. For both its not working.

Class Test(db.Expando):
       name = StringProperty()
       pagehit = IntegerProperty()

this is what I tried and would like to do
___________________________

test = Test (name =  "blah")
if test is not None:
       test.pagehit + =1
else:
     test = Test()
     test.name = "blah"
     test.pagehit = 1
 test.put()

__________________________

I am not sure even how to make sure an entiry is unique ? (for ex:
here i would like to make name as a unique property for the entiry)

Help appreciated !

Thanks.

--RJ

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