python 字典排序

orderedDict 保持元素插入时的顺序

from collections import OrderedDict

d = OrderedDict()
d['foo'] = 1
d['bar'] = 2
d['spam'] = 3
d['grok'] = 4

Outputs "foo 1", "bar 2", "spam 3", "grok 4"

for key in d:
print(key, d[key])