Comments (9)
@rmorshea These are bugs that need to be fixed please by the way. This is a basic requirement of multiple inheritance in Python.
from traitlets.
- I think
super().__init__
is left out becauseHasTraits
inherits from object. - If I'm right this change in #173 is the positional argument problem you mentioned?
- Value setting from kwargs in
HasTraits.__init__
isn't something I'm attached to, but others probably are, and I imagine it'd represent a pretty big API breakage that would have to come inv5.0
if it were to come at all.
from traitlets.
-
That doesn't matter. A class can inherit from
HasTraits
and something else, which is why you must callsuper
. E.g.class B: def __init__(self, *, x, **kwargs): super().__init__(**kwargs) self.y = f(x) class A(HasTraits, B): pass
is broken.
B.__init__
is never called. -
Yes, thank you!
-
This breaks multiple inheritance. I personally don't think it's good Python. The only class that does this is
dict
, and I think that was a mistake that's unfortunately too late to fix. However, it is not too late fortraitlets
.
from traitlets.
@NeilGirdhar - see #174
from traitlets.
As for the value setting with kwargs, I'd create a separate issue for it and ping minrk, ellisonbg, and SylvainCorlay. I'm not sure what their reasons have been for keeping it so I can't speak for them on that.
from traitlets.
@rmorshea Okay thanks. Note that unless you forward the kwargs
to the super call in #174, my example above is still broken since x
will be swallowed before it ever reaches B.__init__
.
from traitlets.
@NeilGirdhar, unfortunately you can't do that since object.__init__
doesn't accept any args or kwargs.
from traitlets.
@rmorshea You just forward the args and kwargs. If none of the superclasses consume them, then you're right that object.__init__
will raise. If there are none left, then there is no problem. This is how cooperative multiple inheritance works in Python.
from traitlets.
Args are passed through to super in #175
from traitlets.
Related Issues (20)
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from traitlets.