您完全不能依赖键顺序：
>>> {1: None, 9: None}{1: None, 9: None}>>> {9: None, 1: None}{9: None, 1: None}>>> {1: None, 2: None}{1: None, 2: None}>>> {2: None, 1: None}{1: None, 2: None}字典是无序的。在Python 2.7中有
collections.OrderedDict。
![其他Python dict（）中的键顺序[重复]](http://www.mshxw.com/aiimages/31/647342.png "其他Python dict（）中的键顺序[重复]")
您完全不能依赖键顺序：
>>> {1: None, 9: None}{1: None, 9: None}>>> {9: None, 1: None}{9: None, 1: None}>>> {1: None, 2: None}{1: None, 2: None}>>> {2: None, 1: None}{1: None, 2: None}字典是无序的。在Python 2.7中有
collections.OrderedDict。
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