61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
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# stock.py
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class Stock:
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__slots__ = ('name','_shares','_price')
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_types = (str, int, float)
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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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# Note: The !r format code produces the repr() string
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return f'{type(self).__name__}({self.name!r}, {self.shares!r}, {self.price!r})'
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def __eq__(self, other):
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return isinstance(other, Stock) and ((self.name, self.shares, self.price) ==
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(other.name, other.shares, other.price))
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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 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(f'Expected {self._types[1].__name__}')
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if value < 0:
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raise ValueError('shares must be >= 0')
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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(f'Expected {self._types[2].__name__}')
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if value < 0:
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raise ValueError('price must be >= 0')
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self._price = value
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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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def sell(self, nshares):
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self.shares -= nshares
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# Sample
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if __name__ == '__main__':
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import reader
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from tableformat import create_formatter, print_table
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portfolio = reader.read_csv_as_instances('../../Data/portfolio.csv', Stock)
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formatter = create_formatter('text')
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print_table(portfolio,['name','shares','price'], formatter)
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