Python中是否有等效的switch语句?
Python 3.10及以上版本
在Python 3.10中,他们引入了模式匹配。
来自Python文档的示例:
def http_error(status):
match status:
case 400:
return "Bad request"
case 404:
return "Not found"
case 418:
return "I'm a teapot"
# If an exact match is not confirmed, this last case will be used if provided
case _:
return "Something's wrong with the internet"
Python 3.10之前
虽然官方文档很乐意不提供切换,但我已经看到了使用字典的解决方案。
例如:
# define the function blocks
def zero():
print "You typed zero.\n"
def sqr():
print "n is a perfect square\n"
def even():
print "n is an even number\n"
def prime():
print "n is a prime number\n"
# map the inputs to the function blocks
options = {0 : zero,
1 : sqr,
4 : sqr,
9 : sqr,
2 : even,
3 : prime,
5 : prime,
7 : prime,
}
然后调用等效开关块:
options[num]()
如果你严重依赖失败,这就会开始崩溃。