This method is called with parameters such as an account holder name and the current stock price of the single stock that this account holder owns.
调用这个方法时使用的参数是帐户持有人姓名，以及这个帐户持有人拥有的单只股票的当前价格。
The portfoliovalue method is invoked by the caller to compute the stock portfolio value of a given account holder name.
调用者通过调用 portfoliovalue方法计算给定帐户持有人的股票投资组合价值。
The portfoliovalue method is invoked by the caller to compute the stock portfolio value of a given account holder name.
调用者通过调用 portfoliovalue方法计算给定帐户持有人的股票投资组合价值。
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