En Fri, 09 Mar 2007 21:25:24 -0300, Paulo da Silva <[EMAIL PROTECTED]> escribió:
> Thanks Gabriel. This sounds very nice for my purpose. > I have some doubts however. How do I "transform" a list into > MyList? Is this the best way? > > class MyList(list): > def __init__(self,l=None): > if l != None: > self=copy(l) (or self.extend(l) - this does not need > copy module) > > Then I can do something like xl=MyList([ ... ]) Just omit the __init__ method, if you don't have anything additional to do. The inherited method will be used instead, as always: py> class MyList(list): ... def cdr(self): ... return self[1:] ... py> a = MyList([1,2,3]) py> a [1, 2, 3] py> type(a) <class '__main__.MyList'> py> a.cdr() [2, 3] > I read the description of __new__ but I didn't fully understand it and > didn't find any examples on how it is used. > Is it usable in this context? How? Not really. Would be useful for a tuple (inmutable), because it has no __init__. But ask again when you really need it :) -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
