Xavier Décoret wrote:
> What I wanted to do is something like this:
>
> def change(x,v):
> x = v
>
> class A(object):
> def __init__(self,v):
> self.x = v
>
> a = A(3)
> print a.x # displays 3
> change(a.x,4)
> print a.x # still displays 3
How about this?
def change(x, v):
x.x = v
Then call it with
change(a, 4)
And print a.x will return 4 as you wish.
> It may seem weird, but I ensure there is a reason for doing this. In C++
> (the language I am mot familiar with), I could define f to take a
> pointer to member function of a class, a pointer and a value and achieve
> what I want.
In Python the closest match to this might be to pass the reference to
the object, plus the *name* of the attribute, as a string.
def change(obj, attr, v):
setattr(obj, attr, v)
This, of course, is now a useless function since that's what "setattr"
already does...
So:
a = A(3)
print a.x # displays 3
setattr(a, 'x', 4)
print a.x # displays 4
-Peter
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