objectoriented -?- functional

[Peter Otten]

Walther Neuper wrote:

> loving Java (oo) 

Don't mind, weirder things have happened 

http://wiki.muenster.org/index.php/Schwan

> as well as SML (fun) I use to practice both of them 
> separately.
> Now, with Python I would like to combine 'oo.extend()' with 'functional
> map':
> 
> Python 2.4.4 (#2, Oct 22 2008, 19:52:44)
> [GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> def reverse_(list):
> ...     """list.reverse() returns None; reverse_ returns the reversed
> list"""
> ...     list.reverse()
> ...     return list
> ...
>  >>> ll = [[11, 'a'], [33, 'b']]
>  >>> l = ll[:]  # make a copy !
>  >>> l = map(reverse_, l[:])  # make a copy ?
>  >>> ll.extend(l)
>  >>> print("ll=", ll)
> ('ll=', [['a', 11], ['b', 33], ['a', 11], ['b', 33]])
> 
> But I expected to get ...
> ('ll=', [[11, 22], [33, 44], [22, 11], [44, 33]])
> ... how would that elegantly be achieved with Python ?

Sorry, I cannot infer the pattern. How would you do that at all?

Peter