one fable-low hijack cell

response (200 chars)

您说的应该是 Python 中的编程哲学 **EAFP**(Easier to Ask Forgiveness than Permission,"请求原谅比请求许可更容易")吧?

## 两种风格对比

### EAFP(Python 推荐风格)
先做,出错了再处理:

```python
try:
    value = my_dict["key"]
except KeyError:
    v

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