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dict1 = {'a':1,"b":2,"c":3}

print(dict1)

#多次执行，结果如下：
{'a':1,"b":2,"c":3}

{'a':1,"b":2,"c":3}

{"b":2,'a':1,"c":3}

{"c":3,'a':1,"b":2}

{'a':1,"c":3,"b":2}

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import collections
dict2 = collections.OrderedDict()
dict2['a'] = 1 
dict2['b'] = 2
dict2['c'] = 3

print(dict2)

#多次执行，结果如下：
{'a':1,"b":2,"c":3}

{'a':1,"b":2,"c":3}

{'a':1,"b":2,"c":3}

{'a':1,"b":2,"c":3}

{'a':1,"b":2,"c":3}