基础学习:function
1.function 1.key word:def x(arguments) 2.docstring,at the firstline of function body,for example'***print hello world***' 3.arguments style:formal and positonal.definition like:1.(a,keyword1="a",keyword1="b")2.(a,*arguments1,**keywordTypeArguments2) invoke like:1.(1,keyword1="x") 2.(a,x,d,c,...,keyword1="x1",keywod2="x2"...)3.(*args)(**args) 4.hard to know:4.7.5 Lambda Forms
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