objectoriented -?- functional

Walther Neuper neuper at ist.tugraz.at
Wed Mar 18 11:26:51 CET 2009


Hi,

loving Java (oo) 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 ?

Cheers, Walther

-- 
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Walther Neuper                          Mailto: neuper at ist.tugraz.at
Institute for Software Technology          Tel: +43-(0)316/873-5728
University of Technology                   Fax: +43-(0)316/873-5706
Graz, Austria                             Home: www.ist.tugraz.at/neuper
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