Dummy value to signal completely undefined values rather than simple None values.
| 45 | |
| 46 | |
| 47 | class _UndefinedType: |
| 48 | """ |
| 49 | Dummy value to signal completely undefined values rather than |
| 50 | simple None values. |
| 51 | """ |
| 52 | |
| 53 | def __bool__(self): |
| 54 | # Haven't defined whether Undefined is falsy or truthy, |
| 55 | # so to avoid subtle bugs raise an error when it |
| 56 | # is used in a comparison without `is`. |
| 57 | raise RuntimeError('Use `is` to compare Undefined') |
| 58 | |
| 59 | def __repr__(self): |
| 60 | return '<Undefined>' |
| 61 | |
| 62 | |
| 63 | _Undefined = _UndefinedType() |
no outgoing calls
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