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# #

class Portfolio:

def __init__(self,holdings) -> None:

self.holdings = holdings

def __iter__(self):

return self.holdings.__iter__()

def __len__(self):

return len(self.holdings)

def __contains__(self,name):

return any([s.name==name for s in self.holdings])

@property

def total_cost(self):

return sum([s.cost for s in self.holdings])