c[:]()

[Brian van den Broek]

Warren Stringer said unto the world upon 05/30/2007 05:31 PM:
> Hmmm, this is for neither programmer nor computer; this is for a user. If I
> wanted to write code for the benefit for the computer, I'd still be flipping
> switches on a PDP-8. ;-)
> 
> This is inconsistent: 
> 
> why does c[:][0]() work but c[:]() does not? 

c[:][0]() says take a copy of the list c, find its first element, and 
call it. Since c is a list of functions, that calls a function.

c[:]() says take a copy of the list c and call it. Since lists are not 
callable, that doesn't work.

> Why does c[0]() has exactly the same results as c[:][0]() ? 

Because c[0] is equal to c[:][0].

> Moreover, c[:][0]() implies that a slice was invoked

Yes, but the complete slice.

> So, tell me, for scheduling a lot of asynchronous events, what would be more
> readable than this:
> 	
> 	bidders = [local_members] + [callin_members]
> 	bidders[:].sign_in(roster)
> 	...

for bidder in [local_members] + [callin_members]:
     bidder.sign_in(roster)

Best,

Brian vdB

> \~/
> 
>> -----Original Message-----
>> From: python-list-bounces+warren=muse.com at python.org [mailto:python-list-
>> bounces+warren=muse.com at python.org] On Behalf Of Carsten Haese
>> Sent: Wednesday, May 30, 2007 12:55 PM
>> To: python-list at python.org
>> Subject: Re: c[:]()
>>
>> On Wed, 2007-05-30 at 11:48 -0700, Warren Stringer wrote:
>>> I want to call every object in a tupple, like so:
>>>
>>> #------------------------------------------
>>> def a: print 'a'
>>> def b: print 'b'
>>> c = (a,b)
>>>
>>>>>> c[:]()  # i wanna
>>> [...]
>>> Is there something obvious that I'm missing?
>> Yes: Python is not Perl.
>>
>> Python is based on the principle that programmers don't write computer
>> code for the benefit of the computer, but for the benefit of any
>> programmer who has to read their code in the future. Terseness is not a
>> virtue. To call every function in a tuple, do the obvious:
>>
>> for func in funcs: func()
>>
>> HTH,
>>
>> --
>> Carsten Haese
>> http://informixdb.sourceforge.net
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
> 
>