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# mode: run
# tag: pep557, pure3.7
import dataclasses
from typing import Sequence
@dataclasses.dataclass
class Color:
"""
>>> list(Color.__dataclass_fields__.keys())
['red', 'green', 'blue', 'alpha']
>>> Color(1, 2, 3)
Color(red=1, green=2, blue=3, alpha=255)
>>> Color(1, 2, 3, 4)
Color(red=1, green=2, blue=3, alpha=4)
>>> Color(green=1, blue=2, red=3, alpha=40)
Color(red=3, green=1, blue=2, alpha=40)
"""
red: int
green: int
blue: int
alpha: int = 255
@dataclasses.dataclass
class NamedColor(Color):
"""
>>> list(NamedColor.__dataclass_fields__.keys())
['red', 'green', 'blue', 'alpha', 'names']
>>> NamedColor(1, 2, 3)
NamedColor(red=1, green=2, blue=3, alpha=255, names=[])
>>> NamedColor(1, 2, 3, 4)
NamedColor(red=1, green=2, blue=3, alpha=4, names=[])
>>> NamedColor(green=1, blue=2, red=3, alpha=40)
NamedColor(red=3, green=1, blue=2, alpha=40, names=[])
>>> NamedColor(1, 2, 3, names=["blackish", "very dark cyan"])
NamedColor(red=1, green=2, blue=3, alpha=255, names=['blackish', 'very dark cyan'])
"""
names: Sequence[str] = dataclasses.field(default_factory=list)
@dataclasses.dataclass(frozen=True)
class IceCream:
"""
>>> IceCream("vanilla")
IceCream(flavour='vanilla', num_toppings=2)
>>> IceCream("vanilla") == IceCream("vanilla", num_toppings=3)
False
>>> IceCream("vanilla") == IceCream("vanilla", num_toppings=2)
True
"""
flavour: str
num_toppings: int = 2
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