python入门（六）装饰器的理解
装饰器用于拓展原有函数功能的一种函数比如：
def helloWorld(fun) def out()
print ("======start========")
fun()
print ("=====end======")
return out
@helloWorld
def back ()
print ("let's go")
back()
运行结果：
======start========
let's go
=====end======
@%E7%AC%A6%E5%8F%B7%E6%98%AF%E8%A3%85%E9%A5%B0%E5%99%A8%E7%9A%84%E8%AF%AD%E6%B3%95%E7%B3%96%EF%BC%8C%E5%9C%A8%E5%AE%9A%E4%B9%89%E5%87%BD%E6%95%B0%E7%9A%84%E6%97%B6%E5%80%99%E4%BD%BF%E7%94%A8%EF%BC%8C%E9%81%BF%E5%85%8D%E5%86%8D%E4%B8%80%E6%AC%A1%E8%B5%8B%E5%80%BC%E6%93%8D%E4%BD%9C
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