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40 lines
1.5 KiB
40 lines
1.5 KiB
class Auto:
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"""A placeholder class to denote an automatically assigned default value."""
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def __repr__(self):
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return "<Auto>"
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from dataclasses import dataclass, field, fields as dc_fields
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from typing import Any, List
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def apply_auto_defaults(cls):
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for f in dc_fields(cls):
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# Check if the field's default is an instance of Auto
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if isinstance(f.default, Auto):
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# Determine the appropriate default factory based on type hints
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if f.type == bool:
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default_factory = bool
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elif f.type == list:
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default_factory = list
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elif f.type == int:
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default_factory = int
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else:
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raise TypeError(f"Unsupported field type for auto-default: {f.type}")
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# Replace the placeholder with an actual dataclass field with default_factory
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setattr(cls, f.name, field(default_factory=default_factory))
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return cls
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@apply_auto_defaults
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@dataclass
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class CarControl:
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enabled: bool = Auto() # Auto will be replaced with field(default_factory=bool)
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speed: int = Auto() # Auto will be replaced with field(default_factory=int)
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tags: List[str] = Auto() # Auto will be replaced with field(default_factory=list)
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# This will instantiate the dataclass with the fields set to their default types
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car_control = CarControl()
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print(car_control.enabled) # Expected: False
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print(car_control.speed) # Expected: 0
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print(car_control.tags) # Expected: []
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