__getattribute__ and methods proxying

[Giampaolo Rodolà]

Hi,
I have a class which looks like the one below.
What I'm trying to accomplish is to "wrap" all my method calls and
attribute lookups into a "proxy" method which translates certain
exceptions into others.
The code below *apparently* works: the original method is called but
for some reason the "except" clause is totally ignored.

I thought __getattribute__ was designed for such kind of things
("proxying") but apparently it seems I was wrong.



class NoSuchProcess(Exception): pass
class AccessDenied(Exception): pass


class Process(object):

    def __getattribute__(self, name):
        # wrap all method calls and attributes lookups so that
        # underlying OSError exceptions get translated into
        # NSP and AD exceptions
        try:
            print "here 1!"
            return object.__getattribute__(self, name)
        except OSError, err:
            print "here 2!"
            if err.errno == errno.ESRCH:
                raise NoSuchProcess
            if err.errno == errno.EPERM:
                raise AccessDenied

    def cmdline(self):
        raise OSError("bla bla")


proc = Process()
proc.cmdline()



--- Giampaolo
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil