128 lines
4.2 KiB
Python
128 lines
4.2 KiB
Python
"""Here is a dictionary of supported currencies defined. Which could be easily
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extended with new ones.
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Each entry is a dictionary that has an ISO code of a currency as its key. Or it
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can be slightly differ from an ISO code to represent a modified version of a
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currency.
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Each entry consists of following fields:
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name -- a full name of a currency;
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description -- usually a country where this currency is used is being
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mentioned. Plus additional information;
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count -- a number of coins in a currency;
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names -- an array of names for each coins' face values;
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multipliers -- an array of multipliers for each face value in a decimal*
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format.
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* - Decimal is used to avoid problems of rounding float numbers. So first two
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digits to the right are used to store a fraction part. You can simply divide
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this number by 100 to get a regular floating-point number.
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"""
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from typing import Dict, List, TypedDict
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__all__ = ["CURRENCIES", "DEFAULT_CURRENCY", "BaseCurrencyError",
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"CurrencyIsNotSupportedError", "CurrenciesCoinCountMismatchError",
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"CurrencyMismatchError", "print_supported_currencies"]
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class BaseCurrencyError(Exception):
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"""Base class for all currency exeptions."""
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def __init__(self, message=None, *args, **kwargs) -> None:
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if message is None:
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message = self.__doc__
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super().__init__(message, *args, **kwargs)
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class CurrencyIsNotSupportedError(BaseCurrencyError):
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"""Currency is not supported."""
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pass
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class CurrencyMismatchError(BaseCurrencyError):
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"""Currencies doesn't match, but they must do so."""
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def __init__(self, extra=None):
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if not extra is None:
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super().__init__(f"{self.__doc__} {extra}")
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else:
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super().__init__(self.__doc__)
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class CurrenciesCoinCountMismatchError(BaseCurrencyError):
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"""Count of coins of a new currency and an old one should be equal."""
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pass
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DEFAULT_CURRENCY: str = "SRUB"
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class Currency(TypedDict):
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name: str
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description: str
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count: int
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names: List[str]
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multipliers: List[int]
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CURRENCIES: Dict[str, Currency] = {
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"RUB": {
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"name": "Ruble",
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"description": "Russian Federation",
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"count": 8,
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"names": ["1к.", "5к.", "10к.", "50к.", "1₽", "2₽", "5₽", "10₽"],
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"multipliers": [1, 5, 10, 50, 1_00, 2_00, 5_00, 10_00]
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},
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"SRUB": {
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"name": "Ruble (shortened)",
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"description": "Russian Federation. Excluding coins of 1 and 5 kopek",
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"count": 6,
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"names": ["10к.", "50к.", "1₽", "2₽", "5₽", "10₽"],
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"multipliers": [10, 50, 1_00, 2_00, 5_00, 10_00]
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},
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"BYN": {
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"name": "Belarusian ruble",
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"description": "Belarus",
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"count": 8,
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"names": ["1к.", "2к.", "5к.", "10к.", "20к.", "50к.", "1р.", "2р."],
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"multipliers": [1, 2, 5, 10, 20, 50, 1_00, 2_00]
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},
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"UAH": {
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"name": "Ukrainian hryvnia",
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"description": "Ukraine",
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"count": 10,
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"names": ["1к.", "2к.", "5к.", "10к.", "25к.", "50к.", "₴1", "₴2",
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"₴5", "₴10"],
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"multipliers": [1, 2, 5, 10, 25, 50, 1_00, 2_00, 5_00, 10_00]
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},
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"USD": {
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"name": "Dollar",
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"description": "United States of America",
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"count": 6,
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"names": ["1¢", "5¢", "10¢", "25¢", "50¢", "$1"],
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"multipliers": [1, 5, 10, 25, 50, 1_00]
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},
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"EUR": {
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"name": "Euro",
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"description": "European Union",
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"count": 8,
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"names": ["1c", "2c", "5c", "10c", "20c", "50c", "€1", "€2"],
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"multipliers": [1, 2, 5, 10, 20, 50, 1_00, 2_00]
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},
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"GBP": {
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"name": "Pound sterling",
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"description": "United Kingdom",
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"count": 9,
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"names": ["1p", "2p", "5p", "10p", "20p", "25p", "50p", "£1", "£2"],
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"multipliers": [1, 2, 5, 10, 20, 25, 50, 1_00, 2_00]
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}
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}
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def print_supported_currencies() -> None:
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"""Print a list of supported currencies."""
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print("Supported currencies are:")
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for cur in CURRENCIES:
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print(f" {cur:^4} ┃ {CURRENCIES[cur]['name']:^31}"
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f"┃ {CURRENCIES[cur]['description']}")
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print("Default currency is", DEFAULT_CURRENCY)
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