super() lets you avoid referring to the base class explicitly, which can be nice. . But the main advantage comes with multiple inheritance, where all sorts of fun stuff can happen. See the standard docs on super if you haven’t already.
What’s the difference between:
Say I have a multiple inheritance scenario:
In Python 3.x, super() can be called without arguments:
I get some error that I can’t figure out. Any clue what is wrong with my sample code?
The following use of super() raises a TypeError: why?
In Python 2.5, the following code raises a TypeError:
I have code like this:
I’m running Python 2.5, so this question may not apply to Python 3. When you make a diamond class hierarchy using multiple inheritance and create an object of the derived-most class, Python does the Right Thing (TM). It calls the constructor for the derived-most class, then its parent classes as listed from left to right, then the grandparent. I’m familiar with Python’s MRO; that’s not my question. I’m curious how the object returned from super actually manages to communicate to calls of super in the parent classes the correct order. Consider this example code:
I see everywhere examples that super-class methods should be called by: