tobiah wrote:
> I should have made it more clear that Foo is a class:
>
>
> class Foo:
>
> def __init__(self, *args):
>
> for arg in args:
> if is_fruit(arg):
> del(self)
>
>
>
> tobiah wrote:
> > Suppose I do:
> >
> >
> > myfoo = Foo('grapes', 'oranges')
> >
> > And in the __init__() of Foo, there is
> > a real problem with the consumption of fruit.
> > Is there a clean way to ensure that myfoo
> > will be None after the call? Would the
> > __init__() just do del(self), or is there
> > a better way to think about this?
> >
> > Thanks,
> >
> > Toby
> >
>
I don't think there is a way to do this (but I could be wrong):
|>> class f:
... def __init__(self):
... del self
...
|>> e = f()
|>> e
<__main__.f instance at 0xb7dd91ec>
|>> class f:
... def __init__(self):
... return None
...
|>> e = f()
|>> e
<__main__.f instance at 0xb7dd934c>
But you could raise an exception and check for it:
|>> class f:
... def __init__(self, flag=True):
... if not flag:
... raise
...
|>> def f_factory(flag):
... try:
... e = f(flag)
... except:
... e = None
... return e
...
|>> foo = f_factory(True)
|>> foo
<__main__.f instance at 0xb7dd944c>
|>> foo = f_factory(False)
|>> foo
|>> print foo
None
There might be a way using __new__(), but I don't know what or how.
Also, "del" is a statement, not a function. You don't need to use
()'s.
HTH,
~Simon
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