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from decimal import Decimal
class Trade:
"""
Represents a cryptocurrency trade, including the amount traded, total cost, and the date of trade.
Provides methods to modify the trade and access various attributes.
"""
def __init__(self, amount: float|Decimal, total_cost: float|Decimal, date: str) -> None:
"""
Initialize a new Trade instance.
Args:
amount (Decimal): The amount of cryptocurrency traded.
total_cost (Decimal): The total cost of the trade.
date (str): The date of the trade, formatted as a string.
"""
if amount <= 0 or total_cost <= 0:
raise ValueError("Amount and total cost must be > 0")
self.__amount: Decimal = Decimal(amount)
self.__total_cost: Decimal = Decimal(total_cost)
self.__date: str = date
def remove_coins(self, amount: float|Decimal) -> None:
"""
Reduce the amount of cryptocurrency in the trade by a specified amount.
Args:
amount (Decimal): The amount of cryptocurrency to remove.
Raises:
ValueError: If the amount to remove exceeds the current amount in the trade.
"""
if amount > self.__amount:
raise ValueError(f"Can't remove more than {self.__amount}")
amount = Decimal(amount)
self.__total_cost -= amount * self.price_per_coin
self.__amount -= amount
@property
def amount(self) -> Decimal:
"""
Get the current amount of cryptocurrency in the trade.
Returns:
Decimal: The amount of cryptocurrency.
"""
return self.__amount
@property
def total_cost(self) -> Decimal:
"""
Get the total cost of the trade.
Returns:
Decimal: The total cost of the trade.
"""
return self.__total_cost
@property
def date(self) -> str:
"""
Get the date of the trade.
Returns:
str: The trade date as a string.
"""
return self.__date
@property
def price_per_coin(self) -> Decimal:
"""
Calculate the price per coin based on the total cost and current amount.
Returns:
Decimal: The price per coin.
Raises:
ZeroDivisionError: If the current amount is zero.
"""
if self.amount == 0:
raise ZeroDivisionError("Price per coin cannot be calculated when the amount is zero")
return self.total_cost / self.amount
def __repr__(self) -> str:
"""
Get a string representation of the Trade instance.
Returns:
str: A formatted string displaying the trade details.
"""
return f"Trade(amount={self.amount}, price_per_coin={self.price_per_coin:.2f}, total_cost={self.total_cost:.2f}, date={self.date})"
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