from collections import KeysView, ItemsView, ValuesView
class DictSorted(dict):
def __new__(*args, **kwargs):
new_dict = dict.__new__(*args, **kwargs)
new_dict.ordered_keys = []
return new_dict
def __setitem__(self, key, value):
'''self[key] = value syntax'''
if key not in self.ordered_keys:
self.ordered_keys.append(key)
super().__setitem__(key, value)
def setdefault(self, key, value):
if key not in self.ordered_keys:
self.ordered_keys.append(key)
return super().setdefault(key, value)
def keys(self):
return KeysView(self)
def values(self):
return ValuesView(self)
def items(self):
return ItemsView(self)
def __iter__(self):
'''for x in self syntax'''
return self.ordered_keys.__iter__()
