Exceptions

In addition to the DB datastore exceptions, the NDB datastore provides the following exception classes:

exception ComputedPropertyError()
Raised when attempting to set a value to or delete a computed property.
exception InvalidPropertyError()
Raised when a property is not applicable to a given use. For example, a property must exist and be indexed to be used in a query's projection or group by clause.
exception ReadonlyPropertyError()
Raised when attempting to set a property value that is read-only.
exception UnprojectedPropertyError()
Raised when getting a property value that's not in the projection.

Monitor your resources on the go

Get the Google Cloud Console app to help you manage your projects.

Send feedback about...

App Engine standard environment for Python