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(1) help(formula)
(2)len?
方法(2)不仅适用于查找帮助文档,也适用于对象方法,例如L=[1,2,3] L.insert? 可以得到对L应用insert函数的具体用法
甚至可以查看对象本身L?,或者查看自己创建的函数square?二、获取源代码square??如果后缀??不能获得源代码,就说明源代码不是用python语言写的。三
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