python args & kwargs

標籤：

 

Today,We will talk some about the argument and arguments ...

#!/usr/bin/pythondef fun(*args):    for value in args:        print valueif __name__ == ‘__main__‘:        fun(11,22,33,44,55)

 

What is type of (*args) ?

Do you really want to know ,just keep read ...

#!/usr/bin/pythondef fun(*args):    print type(args)    for value in args:        print valueif __name__ == ‘__main__‘:        fun(11,22,33,44,55)

 

Okay,We know the (*args ) just a tuple type?

so,we can input a tuple as argument ...

#!/usr/bin/pythondef fun(*args):    print type(args)    for value in args:        print valueif __name__ == ‘__main__‘:        my_tuple=(11,22,33,44,55)    fun(my_tuple) 

 

Oh,What happened ? The result is no what we expect ...

See the below code,you will find the answer ...

#!/usr/bin/pythondef fun(*args):    print type(args)    for value in args:        print valueif __name__ == ‘__main__‘:        my_tuple=(11,22,33,44,55)    fun(*my_tuple)

 

Okay,see we got the result what we expect ...

 

Good,time to talk (**kwargs)

#!/usr/bin/pythondef fun(**kwargs):        print type(kwargs)    for key in kwargs:        print ‘key: ‘,key,‘value: ‘,kwargs[key]    if __name__ == ‘__main__‘:    fun(name=‘Frank‘,age=23,school=‘IMUT‘)

 

 

Of course,you can input a dict as argument,but Don‘t forget the (**) again ...

If you really want to forget (**) ,like the below code ...

#!/usr/bin/pythondef fun(**kwargs):        print type(kwargs)    for key in kwargs:        print ‘key: ‘,key,‘value: ‘,kwargs[key]    if __name__ == ‘__main__‘:    my_dict={‘name‘:‘Frank‘,‘age‘:23,‘school‘:‘IMUT‘}    fun(my_dict)

 

You will got a error like the below :

 

So ,You don‘t really want to do it again ,right ...haha

#!/usr/bin/pythondef fun(**kwargs):        print type(kwargs)    for key in kwargs:        print ‘key: ‘,key,‘value: ‘,kwargs[key]    if __name__ == ‘__main__‘:    my_dict={‘name‘:‘Frank‘,‘age‘:23,‘school‘:‘IMUT‘}    fun(**my_dict)

 

Okay ! see the right result :

 

Thank you !

python args & kwargs