super

I want to to extend a trait within a trait, like this: trait NodeTypes { trait Node { def allNodesHaveThis: Int } } trait ScrumptiousTypes extends NodeTypes { trait Node extends super.Node { def scrumptiousness: Int } } trait YummyTypes extends NodeTypes { trait Node extends super.Node { def yumminess: Int } } object Graph extends NodeTypes with ScrumptiousTypes with YummyTypes { case class Node() extends super.Node { override def allNodesHaveThis = 1 override def scrumptiousness = 2 // error: ScrumptiousTypes.Node has been disinherited override def yumminess = 3 } } If this works, it would be

I am new to Objective C.I am trying aout some example programs.I could not understand how the self and super methods work in objective C. In the pgm below CashTransaction.m [super trackSpending:amount] is called and in CreditCardTransaction.m [self trackSpending:amount] is called.I could not find difference between the self and super.super is for invoking the base class overriden method.and self is for invoking the child class overridden method.This is what my understanding is.please correct me if i'm wrong.Thanks in advace. main.m #import <Foundation/Foundation.h> #import "BudgetObject.h"

We can create an OrderedCounter trivially by using multiple inheritance: >>> from collections import Counter, OrderedDict >>> class OrderedCounter(Counter, OrderedDict): ... pass ... >>> OrderedCounter('Mississippi').items() [('M', 1), ('i', 4), ('s', 4), ('p', 2)] Correct me if I'm wrong, but this crucially relies on the fact that Counter uses super : class Counter(dict): def __init__(*args, **kwds): ... super(Counter, self).__init__() ... That is, the magic trick works because >>> OrderedCounter.__mro__ (__main__.OrderedCounter, collections.Counter, collections.OrderedDict, dict, object) The

So... I'm working on trying to move from basic Python to some GUI programming, using PyQt4. I'm looking at a couple different books and tutorials, and they each seem to have a slightly different way of kicking off the class definition. One tutorial starts off the classes like so: class Example(QtGui.QDialog): def __init__(self): super(Example, self).__init__() Another book does it like this: class Example(QtGui.QDialog): def __init__(self, parent=None): super(Example, self).__init__(parent) And yet another does it this way: class Example(QtGui.QDialog): def__init__(self, parent=None): QtGui

According to http://docs.python.org/2/library/functions.html#super , If the second argument is omitted, the super object returned is unbound. Which is super(type). I am wondering what is unbounded and when is it bounded. Edit: in the context of super , much of below is wrong. See the comment by John Y. super(Foo, a).bar returns the method called bar from the next object in the method resolution order (the MRO), in this case bound to the object a , an instance of Foo . If a was left out, then the returned method would be unbound. Methods are just objects, but they can be bound or unbound. An

This question already has answers here : Can Super deal with multiple inheritance? (2 answers) Possible Duplicate: Can Super deal with multiple inheritance? Python inheritance? I have a class structure (below), and want the child class to call the __init__ of both parents. Is this possible to do in a 'super' way or is it just a terrible idea? class Parent1(object): def __init__(self): self.var1 = 1 class Parent2(object): def _init__(self): self.var2 = 2 class Child(Parent1, Parent2): def __init__(self): ## call __init__ of Parent1 ## call __init__ of Parent2 ## super(Child, self).__init__()