5.python Grammar Basic-switch structure

Source: Internet
Author: User
Tags mul

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:
  
 
  1. def add(x,y):
  2. return x+y
  3. def sub(x,y):
  4. return x-y
  5. def mul(x,y):
  6. return x*y
  7. def div(x,y):
  8. return x/y
  9. operation={‘+‘:add,‘-‘:sub,‘*‘:mul,‘/‘:div} #用字典方法存不同类型运算符
  10. def result(x,o,y):
  11. 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
  12. 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.


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5.python Grammar Basic-switch structure

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