alias for data member of class instance?

[Sean McIlroy]

hi all

is there a way to do this ...

class clown:
def __init__(self):
self.x = 0
self.y = ALIAS(self.x) ## FEASIBLE ?

.... so that you get results like this ...

krusty = clown()
krusty.x

>0

krusty.y

>0

krusty.x = 1
krusty.x

>1

krusty.y

>1

.... ? thanks.

peace
stm

[Paul Rubin]

Re: alias for data member of class instance?

"Sean McIlroy" <sean_mcilroy@y ahoo.comwrites:

self.y = ALIAS(self.x) ## FEASIBLE ?

The closest thing is probably to use @property.

[Bruno Desthuilliers]

Re: alias for data member of class instance?

Sean McIlroy a écrit :

hi all
>
is there a way to do this ...
>
class clown:
def __init__(self):
self.x = 0
self.y = ALIAS(self.x) ## FEASIBLE ?
>

class Clown(object):
def __init__(self):
self.x = 0

@apply
def x():
def fget(self):
return self._x
def fset(self, value):
self._x = value
return property(**loca ls())

y = x

[Larry Bates]

Re: alias for data member of class instance?

Sean McIlroy wrote:
Sean McIlroy wrote:

hi all
>
is there a way to do this ...
>
class clown:
def __init__(self):
self.x = 0
self.y = ALIAS(self.x) ## FEASIBLE ?
>
... so that you get results like this ...
>
krusty = clown()
krusty.x

>>0

krusty.y

>>0

krusty.x = 1
krusty.x

>>1

krusty.y

>>1

>
... ? thanks.
>
peace
stm
>

hi all
>
is there a way to do this ...
>
class clown:
def __init__(self):
self.x = 0
self.y = ALIAS(self.x) ## FEASIBLE ?
>
... so that you get results like this ...
>
krusty = clown()
krusty.x

>>0

krusty.y

>>0

krusty.x = 1
krusty.x

>>1

krusty.y

>>1

>
... ? thanks.
>
peace
stm
>

Not sure why you want it, but here is one solution:

class clown:
def __init__(self):
self.x=0
def __getattr__(sel f, key):
if key == 'y': return self.x
return self.__dict__[key]

-Larry

[Bruno Desthuilliers]

Re: alias for data member of class instance?

Sean McIlroy a écrit :

hi all
>
is there a way to do this ...
>
class clown:
def __init__(self):
self.x = 0
self.y = ALIAS(self.x) ## FEASIBLE ?

class Alias(object):
def __init__(self, attrname):
self._attrname = attrname

def __get__(self, instance, cls):
if instance is None:
return self
return getattr(instanc e, self._attrname)

def __set__(self, instance, value):
setattr(instanc e, self._attrname, value)

class Clown2(object):
def __init__(self):
self.x = 0

y = Alias('x')