ComoEmailProperty difere daStringProperty? Considere estes dois exemplos:

# example 1: store an e-mail address in an EmailProperty
class MyModel(db.Model):
  email_address = db.EmailProperty()
m = MyModel()
m.email_address = db.Email("[email protected]")

# example 2: store an e-mail address in a StringProperty
class MyModel(db.Model):
  email_address = db.StringProperty()
m = MyModel()
m.email_address = "[email protected]"