Description:
lifehacks.metaclasses 1.2.4
lifehacks.metaclasses
Structure
📦 lifehacks.metaclasses
├── meta
├── enum
└── EnumException
Installation
pip install lifehacks.metaclasses
Usage
meta metaclass
enum metaclass
EnumException
meta metaclass
There are a few ways to make an meta class.
from lifehacks.metaclasses import meta
class myenum0(metaclass=meta): ...
@meta # preferred method
class myenum1: ...
@meta() # do not use this method
class myenum2: ...
enum metaclass
Same with meta metaclass from above,
there are a few ways to make an enum class.
from lifehacks.metaclasses import enum
# with typing
class MyPalette0(metaclass=enum[Colour]): ...
@enum # preferred method
class MyPalette1: ...
@enum[Colour] # syntax only allowed python>=3.9
class MyPalette2: ...
@enum() # do not use this method
class MyPalette3: ...
usage example:
from lifehacks.metaclasses import enum
@enum
class BasePalette:
BLACK = ...
WHITE = ...
# extending base palette enum
class SubPalette(BasePalette):
RED = ...
GREEN = ...
# can be used in type hinting
def print_colours(palette:enum) -> None:
for name, value in palette:
print(name, value)
print_colours(BasePalette) # BLACK, WHITE
print_colours(SubPalette) # BLACK, WHITE, RED, GREEN
print(BasePalette.BLACK in SubPalette) # True
enum classes are not instantiable, more on that below.
EnumException
enum classes are not instantiable.
If you try to, you get an EnumException
@enum
class Palette: ...
p = Palette() # illegal, raises EnumException
Contributors
Simon - mightbesimon
you?
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
Customer Reviews
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