Search the difference: Why this function defenition does'nt work?

[husam]

Aahz Maruch wrote:

> In article <3C24A967.3070604 at student.kun.nl>,
> husam  <h.jehadalwan at student.kun.nl> wrote:
> 
>>hi, I'm a beginner to python and try to understand some basic stuff. 
>>Hier are two function defenitions , which look the same for me, but the 
>>second one does not work. Can anybody explain why?
>>
>>def fun1 (*args):
>>	sum=args[0]
>>	for next in args[1:]
>>		sum=sum+next
>>	return sum
>>print fun1('a','b','c')
>>
>>>>>abc
>>>>>
>>
>>def fun2 (*args):
>>	sum=args[:0]
>>	for next in args[1:]
>>		sum=sum+next
>>	return sum
>>
>>print fun2('a','b','c')
>>
>>
>>>>>TypeError: illegal argument type for built-in operation
>>>>>
> 
>>>>l=['a','b','c']
>>>>l[0]
>>>>
> 'a'
> 
>>>>l[:0]
>>>>
> []
> 
> That should be enough to figure out your problem.  Next time, try using
> the interactive interpreter to test your code.
>