Python study NOTE 4: lambda expressions and switch, pythonlambda

Python study NOTE 4: lambda expressions and switch, pythonlambda
I. Definition

lambda arg1,arg2... : returnValue

Ii. Example

#!/usr/bin/pythondef f(x,y):    return x*yprint f(2,3)#6g = lambda x,y:x*yprint g(2,3)#6

3. An implementation scheme of switch

#!/usr/bin/pythonfrom __future__ import division#a=int(raw_input('please input num1:'))#b=int(raw_input("please input num2:"))def jia(x,y):    return x+ydef jian(x,y):    return x-ydef cheng(x,y):    return x*ydef chu(x,y):    return x/ydef operator(x,o,y):    if o == '+':        print jia(x,y)    elif o == '-':        print jian(x,y)    elif o == '*':        print cheng(x,y)    elif o == '/':        print chu(x,y)    else:        passoperatord = {'+':jia,'-':jian,'*':cheng,'/':chu}def switchoperator(x,o,y):    print operatord.get(o)(x,y)operator(2,'+', 4)operator(2,'-', 4)operator(2,'*', 4)operator(2,'/', 4)switchoperator(2,'+', 4)switchoperator(2,'-', 4)switchoperator(2,'*', 4)switchoperator(2,'/', 4)