替换 Python 中的 switch 语句? [英] Replacements for switch statement in Python?
问题描述
我想用 Python 编写一个函数,根据输入索引的值返回不同的固定值.
I want to write a function in Python that returns different fixed values based on the value of an input index.
在其他语言中,我会使用 switch
或 case
语句,但 Python 似乎没有 switch
语句.在这种情况下推荐的 Python 解决方案是什么?
In other languages I would use a switch
or case
statement, but Python does not appear to have a switch
statement. What are the recommended Python solutions in this scenario?
推荐答案
下面的原始答案写于 2008 年.从那时起,Python 3.10 (2021) 引入了 match
-case
语句,它提供了开关"的一流实现;对于 Python.例如:
The original answer below was written in 2008. Since then, Python 3.10 (2021) introduced the match
-case
statement which provides a first-class implementation of a "switch" for Python. For example:
def f(x):
match x:
case 'a':
return 1
case 'b':
return 2
match
-case
语句比这个简单的例子强大得多.
The match
-case
statement is considerably more powerful than this simple example.
你可以使用字典:
def f(x):
return {
'a': 1,
'b': 2,
}[x]
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