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update dict.md #22

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update dict.md #22

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3 changes: 3 additions & 0 deletions Datatypes/dict.md
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Expand Up @@ -281,6 +281,7 @@ name: ethan
```

iteritems 的作用大致相同，但会返回一个迭代器对象而不是列表，同样，我们也可以使用这个方法来对字典进行遍历，而且这也是推荐的做法：
(注：iteritems 在 python3 中已不再支持，如有需要可以使用 iter(d.items()))

```python
>>> d = {'name': 'ethan', 'age': 20}
Expand All @@ -296,6 +297,7 @@ name: ethan
## keys/iterkeys

keys 方法将字典的键以列表形式返回，iterkeys 则返回针对键的迭代器。
(注：iterkeys 在 python3 中已不再支持，如有需要可以使用 iter(d.keys()))

看看例子：

Expand All @@ -310,6 +312,7 @@ keys 方法将字典的键以列表形式返回，iterkeys 则返回针对键的
## values/itervalues

values 方法将字典的值以列表形式返回，itervalues 则返回针对值的迭代器。
(注：itervalues 在 python3 中已不再支持，如有需要可以使用 iter(d.values()))

看看例子：

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