每天CookBook之Python-007

OrderedDict的使用

>>> from collections import OrderedDict                                                        
>>> d = OrderedDict()                                                                          
>>> d['foo'] = 1                                                                               
>>> d['bar'] = 2                                                                               
>>> d['spam'] = 3                                                                              
>>> d['grok'] = 4                                                                              
>>> print d                                                                                    
OrderedDict([('foo', 1), ('bar', 2), ('spam', 3), ('grok', 4)])                                
>>> for key in d:                                                                              
...     print (key, d[key])                                                                    
...                                                                                            
('foo', 1)                                                                                     
('bar', 2)                                                                                     
('spam', 3)                                                                                    
('grok', 4)                                                                                    
>>> import json                                                                                
>>> print json.dumps(d)                                                                        
{"foo": 1, "bar": 2, "spam": 3, "grok": 4}                                                     
>>>