[Tutor] Why are arguments sometimes on the left side?

[Joel Goldstick]

On Mon, Sep 20, 2010 at 12:04 PM, Emile van Sebille <emile at fenx.com> wrote:

> On 9/20/2010 7:16 AM Michael Scharf said...
>
>  Why is it
>>    list0.extend(list1)
>> and not
>>    extend(list 0, list1)
>> or
>>    stri0 = stri0.strip()
>> and not
>>    stri0 = strip(stri0)
>> Why have arguments on the left side at all, when usually the dot notation
>> left to right implies a hierarchical relation: file.class or class.method
>> etc.
>>
>>
> You can also have it your way...
>
> >>> def extend(*args):
> ...     try:
> ...         args[0].extend(*args[1:])
> ...     except:
> ...         raise AttributeError
> ...
> >>>
> ...
> >>>
> >>> a = []
> >>> a.extend([1,2,3])
> >>> a
> [1, 2, 3]
> >>> extend(a,[4,5,6])
> >>> a
> [1, 2, 3, 4, 5, 6]
> >>>
>
>
> Emile
>
>
That's pretty creative I think, but not sure its quite on the mark for
beginners? ;)

Anyway, I was quick with my answer.  This is a good place to learn about
list and string methods:

http://docs.python.org/library/stdtypes.html#built-in-types



>
>
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-- 
Joel Goldstick
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