68 lines
1.8 KiB
Python
68 lines
1.8 KiB
Python
class Stock:
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_types = (str, int, float)
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__slots__ = ["name", "_shares", "_price"]
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def __init__(self, name, shares, price):
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self.name = name
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self.shares = shares
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self.price = price
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def __repr__(self):
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return f"Stock({self.name!r}, {self.shares!r}, {self.price!r})"
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def __eq__(self, other):
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if not isinstance(other, Stock):
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return False
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return (self.name, self.shares, self.price) == (
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other.name,
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other.shares,
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other.price,
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)
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@classmethod
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def from_row(cls, row):
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values = [func(val) for func, val in zip(cls._types, row)]
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return cls(*values)
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@property
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def cost(self):
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return self.shares * self.price
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@property
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def shares(self):
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return self._shares
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@shares.setter
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def shares(self, value):
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if not isinstance(value, self._types[1]):
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raise TypeError("Expected int")
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if value < 0:
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raise ValueError("Expected positive integer")
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self._shares = value
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@property
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def price(self):
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return self._price
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@price.setter
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def price(self, value):
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if not isinstance(value, self._types[2]):
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raise TypeError("Expected float")
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if value < 0.0:
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raise ValueError("Expected positive float")
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self._price = value
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def sell(self, num):
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self.shares -= num
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if self.shares < 0:
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self.shares = 0
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def print_portfolio(portfolio):
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headers = ("name", "shares", "price")
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fmtstr = "{0: >10} {1: >10} {2: >10}"
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print(fmtstr.format(*headers))
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print("{0:->10} {1:->10} {2:->10}".format("", "", ""))
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for stock in portfolio:
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print(fmtstr.format(stock.name, stock.shares, stock.price))
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