I’m learning Object Oriented Programming with Mixins. The correct answer is with dunders on each side of main. My answer of the program has no dunders. Top 1 is the mixins of my e-book. Top 2 is the mixins drawn by myself. Can any experts pore over my program and kindly tell me which part(s) of my program is wrong? Thanks.
When you run a Python file as a script, the module the code is executed in is called __main__. That’s why this shows up in the class reprs. __mro__ stands for “Method Resolution Order”, by the way. It’s the order classes are checked for methods. I do notice in your code that you don’t have a B class, is that intentional?
Just from a quick glance at the screenshot, it looks like class D is missing B.
class D(B, C)
Paul, you are a genius. The problem is fully solved, and dunders appear on the each side of main. Question: how did you come up with this solution ? For me, I can’t get the correlation of D(B,C) and dunders.
Moreover, the shade of Mixins’ shape matters and why? Any quick explanation?
From the inheritance tree image that you provided. Notice that D has both B and C pointing towards it. This implies that D is inheriting from them both.
Have you fixed bugs offen? And in my drawing, why is E red?
Mostly in C. But now in Python, it is just a matter of knowing the proper syntax. Kind of like English. You learn to spot misspellings, run-on sentences, syntax/grammatical errors, etc.
Why is E red?
Maybe to signify that it is the last class in the inheritance tree?
@onePythonUser The E in my e-book is black.
Well, they tell you that the order of the inherited classes matters.
They have:
class E(D, C)
but then they point out that you can’t have the following order:
class E(C, D)
Have you tried swapping the order and testing it?
This explanation is much more acceptable. Million thanks. No, I never tried swapping the order and testing it.
Here Endeth the Lesson.