how to confine to write a string in specific list ,on google-app-engine

Question

class FirstModel(db.Model):
    p = db.StringProperty({option:['aa','bb','cc']})

the error is :

NameError: name 'option' is not defined

what should i do ,thanks

Answer 1

You should use:

p = db.StringProperty(choices=set(["aa", "bb", "cc"]))