[dgplug-users] Need Help in understanding the Error Message

[Chaitanya Anil Kukde]

Hi Pabitra,

 From what I understand, the function total is defined using positional 
parameters, while 'name="Adi"' refers to usage of keyword arguments 
which is (as I understand) not allowed and this is the cause of the 
error. Relevant material which might help in understanding the 
underlying mechanisms [0], [1].
The following modification in the code worked for me -

         def total(*args, **kwargs):
         if args:
             print("%s has total money of Rs %d/- " %(kwargs['name'],
    sum(args)))
         else:
             print("%s's piggy bank  has no money" %kwargs['name'])

     >>> total(*(3000, 10, 45), name="John Doe")
    John Doe has total money of Rs 3055/-

Let me know your thoughts. Interesting question btw :)

0. https://docs.python.org/2/tutorial/controlflow.html#keyword-arguments
1. http://stackoverflow.com/a/1419159

Thanks,
Chaitanya

On 02/27/2017 03:07 PM, Pabitra Pati wrote:
> Hi All,
>
> I want to understand the error message I am getting.
> Below is my code piece :-
>
>      def total(name, *args):
>          if args:
>              print("%s has total money of Rs %d/- " %(name, sum(args)))
>          else:
>              print("%s's piggy bank  has no money" %name)
>
> I can call this method passing the extra arguments inside *().
> I know the correct way of passing the arguments. But, I am passing value
> for 'name' in form of param=value, *intentionally*, so that it throws me
> error. However, I am unable to understand the below error message :-
>
>      >>> total(name="Adi", *(1, 2, 10) )
>      Traceback (most recent call last):
>        File "<stdin>", line 1, in <module>
>      TypeError: total() got multiple values for keyword argument 'name'
>
> How Python is evaluating the above call, that it's getting multiple values
> for the parameter 'name'?
>
> Any help is appreciated.
>
>
> *Thanks,*
>
> *Pabitra*
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