Can I reference 1 instance of an object by more names ? rephrase

[Peter Otten]

Stef Mientki wrote:

>> Again, I'm confident, again I didn't test.
> 
> I did, ...
> ... and unfortunately it still gave errors.

Strange.

> So for the moment I'll just stick to my "lots of code solution",
> and I'll try again, when I've some more understanding of these Python
> "internals".

Anyway, here's a self-contained example:

"""
>>> p = cpu_ports()
>>> p
cpu_ports(p1=0, p2=0, p3=0, p4=0, p5=0)
>>> p.p3 = 1
>>> p
cpu_ports(p1=0, p2=0, p3=1, p4=0, p5=0)
>>> p.p4 = 1
>>> p
cpu_ports(p1=0, p2=0, p3=1, p4=1, p5=0)
>>> p.p3 = 0
>>> p
cpu_ports(p1=0, p2=0, p3=0, p4=1, p5=0)

"""

def bit(index):
    def fset(self, value):
        value    = ( value & 1L ) << index
        mask     = ( 1L ) << index
        self._d  = ( self._d & ~mask ) | value
    def fget(self):
        return ( self._d >> index ) & 1
    return property(fget, fset)

class cpu_ports(object) :
    def __init__(self):
        self._d = 0
    def __str__(self):
        return "cpu_ports(%s)" % ", ".join(
            "%s=%s" % (n, getattr(self, n)) for n in ["p1", "p2", "p3", "p4", "p5"])
    __repr__ = __str__
    p1 = bit(1)
    p2 = bit(2)
    p3 = bit(3)
    p4 = bit(4)
    p5 = bit(5)


if __name__ == "__main__":
    import doctest
    doctest.testmod()

Peter