3.1. Enum About¶
List of finite choices
Enumerations
3.1.1. Syntax¶
>>> from enum import Enum
>>>
>>>
>>> class Select(Enum):
... OPTION1 = 1
... OPTION2 = 2
3.1.2. SetUp¶
>>> class Color(Enum):
... RED = '#FF0000'
... GREEN = '#00FF00'
... BLUE = '#0000FF'
3.1.3. Switch¶
>>> mycolor = Color('#00FF00')
>>>
>>> mycolor
<Color.GREEN: '#00FF00'>
>>>
>>> mycolor.name
'GREEN'
>>>
>>> mycolor.value
'#00FF00'
3.1.4. Comparison¶
>>> mycolor = Color('#00FF00')
>>>
>>> mycolor is Color.RED
False
>>>
>>> mycolor is Color.GREEN
True
3.1.5. Iteration¶
>>> for color in Color:
... print(color)
Color.RED
Color.GREEN
Color.BLUE
3.1.6. Methods¶
>>> class Color(Enum):
... RED = '#FF0000'
... GREEN = '#00FF00'
... BLUE = '#0000FF'
...
... @classmethod
... def get_favourite(cls):
... return cls.RED
>>> Color.get_favourite()
<Color.RED: '#FF0000'>
3.1.7. Use Case - 0x01¶
HTML Colors
>>> class Color(Enum):
... AQUA = '#00FFFF'
... BLACK = '#000000'
... BLUE = '#0000ff'
... FUCHSIA = '#FF00FF'
... GRAY = '#808080'
... GREEN = '#008000'
... LIME = '#00ff00'
... MAROON = '#800000'
... NAVY = '#000080'
... OLIVE = '#808000'
... PINK = '#ff1a8c'
... PURPLE = '#800080'
... RED = '#ff0000'
... SILVER = '#C0C0C0'
... TEAL = '#008080'
... WHITE = '#ffffff'
... YELLOW = '#FFFF00'
3.1.8. Use Case - 0x02¶
§6 pkt. 5 - Rozporządzenie Ministra Finansów z dnia 29 kwietnia 2019 r. w sprawie kas rejestrujących. Dziennik Ustaw - rok 2019 poz. 816
PTU - Podatek od Towarów i Usług (Services and Goods Tax)
>>> class PTU(Enum):
... A = 1.23 # VAT 23%
... B = 1.08 # VAT 8%
... C = 1.05 # VAT 5%
... D = 1.00 # VAT 0%
... E = 1.00 # VAT Exempt
>>>
>>> PLN = 1
>>> shopping_cart = [
... {'name': 'Bread', 'price': 3.99*PLN, 'ptu': PTU.C},
... {'name': 'Butter', 'price': 2.69*PLN, 'ptu': PTU.B},
... {'name': 'Ham', 'price': 5.99*PLN, 'ptu': PTU.A},
... {'name': 'Cheese', 'price': 4.19*PLN, 'ptu': PTU.B},
... ]
>>> total = sum(product['price'] * product['ptu'].value
... for product in shopping_cart)
>>> print(f'Total is: {total:.2f} PLN')
Total is: 18.99 PLN