python字典顺序转字符串
普通字典默认是无序的:
比如:
1 a = {'b': 1, 'a': 2} 2 print a 3 print repr(a)
输出:
1 {'a': 2, 'b': 1} 2 {'a': 2, 'b': 1}
有序的字典需要用到OrderedDict:
1 from collections import OrderedDict 2 a = OrderedDict() 3 a['b'] = 2 4 a['a'] = 1 5 print a 6 print repr(a)
输出:
1 OrderedDict([('b', 2), ('a', 1)]) 2 OrderedDict([('b', 2), ('a', 1)])
用json的dumps方法将有序字典转为字符串:
1 from collections import OrderedDict 2 from json import dumps 3 a = OrderedDict() 4 a['b'] = 2 5 a['a'] = 1 6 print a 7 print dumps(a)
输出:
1 OrderedDict([('b', 2), ('a', 1)]) 2 {"b": 2, "a": 1}