The base class of the class hierarchy.
View aliases
Main aliases
`google.appengine.api.appinfo.HttpHeadersDict.KeyValidator.expected_type`, `google.appengine.api.appinfo.HttpHeadersDict.ValueValidator.expected_type`, `google.appengine.api.croninfo.AttemptDeadlineValidator.expected_type`, `google.appengine.api.croninfo.GrocValidator.expected_type`, `google.appengine.api.croninfo.TimezoneValidator.expected_type`, `google.appengine.api.dispatchinfo.DispatchEntryURLValidator.expected_type`, `google.appengine.api.validation.Deprecated.expected_type`, `google.appengine.api.validation.Exec.expected_type`, `google.appengine.api.validation.Normalized.expected_type`, `google.appengine.api.validation.Optional.expected_type`, `google.appengine.api.validation.Options.expected_type`, `google.appengine.api.validation.Preferred.expected_type`, `google.appengine.api.validation.Range.expected_type`, `google.appengine.api.validation.Regex.expected_type`, `google.appengine.api.validation.RegexStr.expected_type`, `google.appengine.api.validation.Repeated.expected_type`, `google.appengine.api.validation.StringValidator.expected_type`, `google.appengine.api.validation.TimeValue.expected_type`, `google.appengine.api.validation.Type.expected_type`
When called, it accepts no arguments and returns a new featureless
instance that has no instance attributes and cannot be given any.