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（1）对于类似如下结构类型的数据，在一定的场合下，希望类似于info.student, info.student.name, info.teacher.course.math 等递归地通过点（.）的方式调用字典的数据

```python
info={
    "student":{
        "name":"zhangsan",
        "age":20,
        "male":"man"
    },
    "teacher":{
        "name":"Mr Wang",
        "age":25,
        "male":"woman",
        "course":{
            "math":"Friday",
            "english":"Monday"
        }
    }
}
```
（2）可通过自定义如下类，然后将上述字典类型的数据转换一下即可
本质是递归的将字典类型的数据转换为Dotdict类型的（即实现了__getattr__的类）
```python
class DotDict(dict):
    def __init__(self, *args, **kwargs):
        super(DotDict, self).__init__(*args, **kwargs)

def __getattr__(self, key):
        value = self[key]
        if isinstance(value, dict):
            value = DotDict(value)
        return value
```
（3）完整代码如下：

```python
class DotDict(dict):
    def __init__(self, *args, **kwargs):
        super(DotDict, self).__init__(*args, **kwargs)

def __getattr__(self, key):
        value = self[key]
        if isinstance(value, dict):
            value = DotDict(value)
        return value

info={
    "student":{
        "name":"zhangsan",
        "age":20,
        "male":"man"
    },
    "teacher":{
        "name":"Mr Wang",
        "age":25,
        "male":"woman",
        "course":{
            "math":"Friday",
            "english":"Monday"
        }
    }
}

dot_info=DotDict(info)
print(dot_info.student)
print(dot_info.student.name)
print(dot_info.teacher.name)
print(dot_info.teacher.course.math)
```
执行结果如下：

```bash
{'name': 'zhangsan', 'age': 20, 'male': 'man'}
zhangsan
Mr Wang
Friday
```

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