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简单的函数实参、形参、默认值的定义-wyz的博客
source link: http://blog.51cto.com/13595859/2089244
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Python语句中可以进行函数调用来简化工作，每个函数都可以完成具体的任务。当遇到相同任务，调用函数方便快捷。函数首先需设定形参（抽象概念），最后赋予具体值（实参），有些具体值可以不变，则可提前设定好默认值。eg.编写一个和T-SHIRT尺码及标语相关的函数：设定好T-SHIRT需输入的形参（尺码及标语），最后赋予具体值defmake_shirt(size,slogan):#size/slogan
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