5.python Grammar Basic-switch structure

Description
    1.switch is clearer and more readable than if...else statements
    2.python does not provide a switch statement 3.pthon uses a dictionary to implement the switch statement function, the implementation method is divided into 2 steps:
A. Define a dictionary;B. Call the dictionary get () to get the corresponding expressionPython code:

  
 

   
  

  
def add(x,y):
   
  

  
 return x+y
   
  

  
def sub(x,y):
   
  

  
 return x-y
   
  

  
def mul(x,y):
   
  

  
 return x*y
   
  

  
def div(x,y):
   
  

  
 return x/y
   
  

  
operation={‘+‘:add,‘-‘:sub,‘*‘:mul,‘/‘:div} #用字典方法存不同类型运算符
   
  

  

   
  

  
def result(x,o,y):
   
  

  
 print operation.get(o)(x,y) #使用get(o)等价于字典中的操作符+-*/对应的键值value即函数
   
  

  

   
  

  
result(10, ‘-‘, 3) #调用函数，验证结果，在中间传什么操作符做什么操作，比起if来程序效率高
  
 

Note: The use of a dictionary-processed switch statement is less than if...else processing, which improves the efficiency of the program.


From for notes (Wiz)

5.python Grammar Basic-switch structure