大话Python中*args和**kargs的使用
对于初学者来说,看到*args和**kargs就头大,到底它们有何用处,怎么使用?这篇文章将为你揭开可变参数的神秘面纱
1.*args 实质就是将函数传入的参数,存储在元组类型的变量args当中
def fun_var_args(farg, *args): print "arg:", farg for value in args: print "other arg:", value fun_var_args(1, "two", 3) arg: 1 other arg: two other arg: 3
2.第二种场景:
def fun_input_list(var1,var2,var3): print var1,var2,var3 var_list=["second",3] fun_input_list(1,*var_list) 1 second 3
3.**kargs 实质就是将函数的参数和值,存储在字典类型的kargs变量中
def fun_var_kargs(farg,**kargs): print "firsr value %s"% farg for key in kargs.keys(): print kargs[key] fun_var_kargs(1,var1="second",var2=35,var3="third") firsr value 1 second third 35
4.**kargs的第二种使用场景
def fun_input_dic(var1,var2=2,var3=3): print var1,var2,var3 dic_input={"var2":2,"var3":"third"} fun_input_dic(1,**dic_input) 1 2 third