[Python-ideas] clear() method for lists

[Paul Moore]

On 11 February 2010 14:51, Gerald Britton <gerald.britton at gmail.com> wrote:
> Say you had a problem where you started with a basic tuple, then
> needed to add items to it to produce some result.  Now suppose you
> want to do that repeatedly.  You don't want to disturb the basic
> tuple, so you make a copy of it before extending it.
>
> e.g.
>
>>>> country = ("US",)
>>>> country_state = tuple(country)+("NY",)
>>>> country_state_city = tuple(country_state) + ("NY",)
>>>> country
> ('US',)
>>>> country_state
> ('US', 'NY')
>>>> country_state_city
> ('US', 'NY', 'NY')
>
> if tuple() had a copy() method, I could write:
>
> country_state = country.copy() + ("NY",)
>
> etc.

You do know that tuples are immutable, don't you?

Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> country = ("US",)
>>> country_state = country+("NY",)
>>> country_state_city = country_state + ("NY",)
>>> country
('US',)
>>> country_state
('US', 'NY')
>>> country_state_city
('US', 'NY', 'NY')

It sounds like you could do with reading the Python documentation a
bit more closely before proposing changes...

Paul