Validate missing values. Raise a :exc:`ValidationError` if `value` should be considered missing.
(self, value: typing.Any)
| 303 | return ValidationError(msg) |
| 304 | |
| 305 | def _validate_missing(self, value: typing.Any) -> None: |
| 306 | """Validate missing values. Raise a :exc:`ValidationError` if |
| 307 | `value` should be considered missing. |
| 308 | """ |
| 309 | if value is missing_ and self.required: |
| 310 | raise self.make_error("required") |
| 311 | if value is None and not self.allow_none: |
| 312 | raise self.make_error("null") |
| 313 | |
| 314 | def serialize( |
| 315 | self, |