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‎.gitignore‎

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.vscode
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.vscode
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.github
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pics
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md2
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tmp
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Python֮·.md
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Python֮·.pdf
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Python之路.md
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Python之路.pdf

‎README.md‎

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**ChainMap逻辑上合并多个字典**
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1) 两种合并字典方法
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(1) 两种合并字典方法
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这是一般的字典合并写法
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```python
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print(merged2) # ChainMap({'x': 1, 'y': 2}, {'y': 3, 'z': 4})
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```
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2) ChainMap节省内存
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(2) ChainMap节省内存
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`ChainMap`这种只在逻辑上合并字典的方法，可以大大节省内存的使用。普通的合并字典会重新创建一个字典，其占用内存会很大，演示如下：
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```python

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