Hello, It's more or less known fact (ref: google) that you can't inherit from multiple generic builtin (as in "coded in C") types:
class C(dict, list): pass TypeError: multiple bases have instance lay-out conflict However, more detailed googling led me to this page of a book: http://books.google.com.ua/books?id=JnR9hQA3SncC&pg=PA104&lpg=PA104 , which suggest that there might be adhoc support for some native types to serve as multiple bases together, but it doesn't provide an example. The book is apparently focused on Python2. I tried to look at typeobject.c:best_base(), which throws the quoted error above, and the only special rules I could quickly decipher from it is that it's possible to multi-inherit from a class and its subclass. Intuitively, it can be understood - it makes no sense to do that on the same inheritance level, but can happen with recursive inheritance, and then there's no need for conflict - both classes can be "merged" into subclass. Indeed, following works: import _collections class Foo(_collections.defaultdict, dict): pass (opposite order gives MRO conflict) So, is that it, or disjoint native types are supported as bases somehow? Also, would someone know if a class-subclass case happens for example in stdlib? As the previous question, https://mail.python.org/pipermail/python-dev/2014-April/134342.html this one is to help set adequate requirements for implementing multiple inheritance in MicroPython. Thanks, Paul mailto:pmis...@gmail.com _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
