21 lines
493 B
Python
21 lines
493 B
Python
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from collections import OrderedDict
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# 如果需要严格控制字典元素的顺序,可以使用OrderedDict
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# 比如用于网络通信协议的未序列化字典对象
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d = OrderedDict()
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d['foo'] = 1
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d['bar'] = 2
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d['spam'] = 3
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d['grok'] = 4
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for key in d:
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print(d[key])
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# 这样就可以序列化得到一个有序的json编码
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import json
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a = json.dumps(d)
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print(a)
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# 尤其注意:这东西内部有一个双向链表导致它的内存开支有点恐怖,大规模情况下谨慎使用
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