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# sentinel value to detect when to replace a field's default | ||
from dataclasses import dataclass, field | ||
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auto = object() | ||
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def check_auto(name, bases, cls_dict): | ||
default = 1 | ||
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cls_annotations = cls_dict.get('__annotations__', {}) | ||
print('cls_annotations2', cls_annotations) | ||
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for name, val in cls_dict.items(): | ||
print('test', name, val) | ||
if val == auto: | ||
# cls_dict[name] = default | ||
# cls_dict[name] = cls_annotations[name] | ||
cls_dict[name] = field(default_factory=cls_annotations[name]) | ||
default += 1 | ||
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cls = type(name, bases, cls_dict) | ||
return cls | ||
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@dataclass(frozen=True) | ||
class State(metaclass=check_auto): | ||
test: int = auto | ||
test2: str = auto | ||
test3: bool = auto | ||
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s = State() | ||
# print(s) # State(val_A=1, val_B=2, val_C=3) | ||
# assert s.val_B == 2 | ||
# | ||
# s = State(val_A=5) | ||
# assert s.val_A == 5 | ||
# assert s.val_C == 3 |
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class Auto: | ||
"""A placeholder class to denote an automatically assigned default value.""" | ||
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def __repr__(self): | ||
return "<Auto>" | ||
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from dataclasses import dataclass, field, fields as dc_fields | ||
from typing import Any, List | ||
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def apply_auto_defaults(cls): | ||
for f in dc_fields(cls): | ||
# Check if the field's default is an instance of Auto | ||
if isinstance(f.default, Auto): | ||
# Determine the appropriate default factory based on type hints | ||
if f.type == bool: | ||
default_factory = bool | ||
elif f.type == list: | ||
default_factory = list | ||
elif f.type == int: | ||
default_factory = int | ||
else: | ||
raise TypeError(f"Unsupported field type for auto-default: {f.type}") | ||
# Replace the placeholder with an actual dataclass field with default_factory | ||
setattr(cls, f.name, field(default_factory=default_factory)) | ||
return cls | ||
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@apply_auto_defaults | ||
@dataclass | ||
class CarControl: | ||
enabled: bool = Auto() # Auto will be replaced with field(default_factory=bool) | ||
speed: int = Auto() # Auto will be replaced with field(default_factory=int) | ||
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 | ||
car_control = CarControl() | ||
print(car_control.enabled) # Expected: False | ||
print(car_control.speed) # Expected: 0 | ||
print(car_control.tags) # Expected: [] |