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# Python 容器基类的使用

![last modify](https://img.shields.io/static/v1?label=last%20modify\&message=2022-10-13%2001%3A56%3A19\&color=yellowgreen\&style=flat-square)

容器基类列表：[collections.abc — Python 文档](https://docs.python.org/zh-cn/3/library/collections.abc.html)

## 使用场景

### Type Hints

```python
# def foo(ls: Union[List, Tuple]):
def foo(ls: Sequence):
    ...
```

### 判断一个具体类或实例是否具有某一特定的接口

```python
from typing import *

# 判断能否 len(obj)，即判断是否实现了 __len__
isinstance(obj, Sized)

# 判断能否 obj[index]
isinstance(obj, Sequence)

# 判断某个类是否可以哈希
issubclass(cls, Hashable)
```


---

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