What's the purpose the hook method showing in a class definition?
On Sun, Oct 20, 2019 at 9:06 PM Ian Hobson <hobson42 at gmail.com> wrote:
> Hi Jach,
> On 20/10/2019 09:34, jfong at ms4.hinet.net wrote:
> > What puzzles me is how a parent's method foo() can find its child's method goo(), no matter it was overwrote or not? MRO won't explain this and I can't find document about it also:-(
> This is a generalised description - Python may be slightly different.
> When foo invokes goo the search for goo starts at the class of the
> object (which is B), not the class of the executing method (i.e not A).
> It then proceeds to look for goo up the class hierarchy - first in B,
> then A then Object.
Yeah, pretty much. In a simple case of linear inheritance, that's how
it works in Python. There are complexities with multiple inheritance
and different languages will do things differently, but that doesn't
affect this example.