# 创建有序字典-OrderDict

代码：

```python
from collections import OrderedDict

'''
先添加的 key-value 对排在前面，后添加的 key-value 对排在后面。这么个顺序。而不是按内部key自动排序
维护双向链表，内存是普通字典2倍
'''

odic=OrderedDict()

odic['k1']='a'
odic['k2']='dab'
odic['k3']='c'
print('odic:',odic)

# 按照第2位（value值）进行排序：lambda oi: oi[1]
sort_od = OrderedDict(sorted(odic.items(), key=lambda oi: oi[1]))
print('sort_od:',sort_od)
```

结果：

```python
odic: OrderedDict([('k1', 'a'), ('k2', 'dab'), ('k3', 'c')])
sort_od: OrderedDict([('k1', 'a'), ('k3', 'c'), ('k2', 'dab')])
```

视频：

```
wait
```


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