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? Add an optional formal parameter to the function make _ album () so that the number of songs contained in the album can be stored. If the number of songs is specified when calling this function, this value is added to the dictionary representing the album. Call this function and specify the number of songs the album contains at least once.Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.半两，说多不多，说少也不少，怎么也够小一个月的开销了。要是他不拿出点手段来，最后初雨被别人抢走了，她就永远不理他了。As a pregnant woman, she carefully fabricated this scam, which is really easy for pregnant women to fall for.　　而大家辛苦带回的血如意，被豆豆故意摔碎（试其真假），竟冰封了整个水月洞天。童博、童战、豆豆和博学多才的神医隐修，侥幸逃过一劫，四人不得不离开水月洞天，