Bind an instance of a base to a subclass - can this be done?
pecoraREMOVE at THISanvil.nrl.navy.mil
Thu May 25 15:39:28 CEST 2006
In article <mailman.6167.1148508382.27775.python-list at python.org>,
Maric Michaud <maric at aristote.info> wrote:
> Le Mercredi 24 Mai 2006 22:04, Diez B. Roggisch a écrit :
> > Nope, not in that way. But you might consider writing a proxy/wrapper
> > for an object. That looks like this (rouch sketch from head):
> > class FileWrapper(object):
> > def init (self, f):
> > self. f = f
> > def getattr (self, name):
> > return getattr(self. f, name)
> > def myreadline(self):
> > ....
> Why use a proxy when you can just inherit from the builtin file object ?
> class myFile(file) :
> def myreadline(self) : print 'yo'
> In : myFile('frwiki-20060511-abstract.xml')
> Out: <open file 'frwiki-20060511-abstract.xml', mode 'r' at 0xa78cc1e4>
> In : myFile('frwiki-20060511-abstract.xml').myreadline()
> In :
BINGO! This is exactly what I want. I didn't realize that I could open
using file itself instead of open. I did find this in another section
of Python in a Nutshell thanks to your suggestion.
And thanks to all who answered.
-- Lou Pecora (my views are my own) REMOVE THIS to email me.
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