multiple-inheritance

My first attempt to combine the features of two dictionaries in the collections module was to create a class that inherits them: from collections import OrderedDict, defaultdict class DefaultOrderedDict(defaultdict, OrderedDict): def __init__(self, default_factory=None, *a, **kw): super().__init__(default_factory, *a, **kw) However, I cannot assign an item to this dictionary: d = DefaultOrderedDict(lambda: 0) d['a'] = 1 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python3.3/collections/__init__.py", line 64, in __setitem__ self.__map[key] = link =

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . I've checked through other questions and surprisingly this question doesn't seem to have been asked. With Extension methods, interfaces provide limited but true implementation multiple inheritance. This brings with it the Diamond problem, the same as with class based multiple inheritance. Why is this better or more acceptable than class based multiple inheritance that so many people seem to find so

This question might sound weird to Java people but if you try to explain this, it would be great. In these days I am clearing some of Java's very basic concept. So I come to Inheritance and Interface topic of Java. While reading this I found that Java does not support Multiple Inheritance and also understood that, what I am not able to understand that why everywhere Diamond figure issue(At least 4 class to create diamond) is discussed to explain this behavior, Can't we understand this issue using 3 classes only. Say, I have class A and class B, these two classes are different (they are not

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

This question already has an answer here: Inherit interfaces which share a method name 5 answers Have code as below // A has a virtual function F(). class A { public: virtual void F() {}; }; // The same for B. class B { public: virtual void F() {}; }; // C inherits A and B. class C : public A, public B { public: // How to implement the 2 virtual functions with the same name but from // different base classes. virtual F() {...} }; Note that there is a default implementation of F() in the base classes. Thanks to Jan Herrmann and Spook. Is the below a simpler solution if we have to use some extra