Python超级超级简易计算器---decorator装饰器写法

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1. print("Python简易计算器--decorator")
   
2. circle=input("请输入一个四则运算式:")
   
3. def all(function):
   
4.     def get():
   
5.         function()
   
6.     return get
   
7. @all
   
8. def start():
   
9.     if circle.partition("+")[0]!=circle:
   
10.         infront=circle.partition("+")[0]
    
11.         behind=circle.partition("+")[2]
    
12.         print(infront,"+",behind,"=",str(float(infront)+float(behind)))
    
13.     elif circle.partition("*")[0]!=circle:
    
14.         infront=circle.partition("*")[0]
    
15.         behind=circle.partition("*")[2]
    
16.         print(infront,"*",behind,"=",str(float(infront)*float(behind)))
    
17.     elif circle.partition("-")[0]!=circle:
    
18.         infront=circle.partition("-")[0]
    
19.         behind=circle.partition("-")[2]
    
20.         print(infront,"-",behind,"=",str(float(infront)-float(behind)))
    
21.     elif circle.partition("/")[0]!=circle:
    
22.         infront=circle.partition("/")[0]
    
23.         behind=circle.partition("/")[2]
    
24.         if behind=="0":
    
25.             print("除数不能为零...程序即将报错停止")
    
26.             assert False
    
27.         print(infront,"/",behind,"=",str(float(infront)/float(behind)))
    
28. start()

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