Python：如何让字典保持有序(使用collections的OrderedDict方法)

from collections imort OrderedDict

d = OrderedDict()

d['aa'] = (1, 30)

d['bb'] = (2, 31)

d['cc'] = (3, 32)

验证：

for k in d:

print(k)

输出：aa  bb  cc（按输入时的顺序输出）