Python中的EAFP原理是什么？

What is the EAFP principle in Python?

在Python中，"使用EAFP原则"是什么意思？你能举些例子吗？

从术语表：

Easier to ask for forgiveness than permission. This common Python coding style assumes the existence of valid keys or attributes and catches exceptions if the assumption proves false. This clean and fast style is characterized by the presence of many try and except statements. The technique contrasts with the LBYL style common to many other languages such as C.

例如，尝试访问字典键。

EAFP：

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try:
x = my_dict["key"]
except KeyError:
# handle missing key

LBYL：

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if"key" in my_dict:
x = my_dict["key"]
else:
# handle missing key

lbyl版本必须在字典中搜索两次键，也可能被认为是可读性稍差。