Is inheritance broken?
jmarshal at mathworks.com
Wed Mar 28 21:58:47 CEST 2001
Skip Montanaro <skip at pobox.com> wrote:
> Someone with more Python years under their belt will have to answer why
> Guido chose depth first instead of breadth first search for methods when
> multiple inheritance is involved. I'm pretty sure it's a choice that can't
> be changed now, however. There's probably too much code that relies on the
> current semantics.
A breadth-first search would be too arbitrary. Additions of
intermediate [super]classes in the inheritance hierarchy could
drastically change the result of a method lookup.
There are other solutions to multiple-inheritance method lookup
besides depth-first searching, but DFS is easy to explain/understand/
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