#!/usr/bin/env python

from collections import OrderedDict

class LoggingDict(dict):
    """
    Dummy class loggs entries to dict.
    Supports cooperative inheritance through use of super
    """
    def __setitem__(self, k, v):
        print('setting %-8r to %r' % (k, v))
        return super(LoggingDict, self).__setitem__(k, v)

class OrderedLoggingDict1(LoggingDict, OrderedDict):
    """
    Dependency injected class that works
    """
    pass

class OrderedLoggingDict2(OrderedDict, LoggingDict):
    """
    Dependency injected class that doesn't work
    """
    pass

old1 = OrderedLoggingDict1()
old2 = OrderedLoggingDict2()

print('adding something to class with (LoggingDict, OrderedDict)')
old1['hooray'] = 'it worked'

print('adding something to class with (OrderedDict, LoggingDict)')
old2['hooray'] = 'it worked'