case / switch语句的Python等效项是什么？

例如：

# define the function blocksdef zero():    print "You typed zero.n"def sqr():    print "n is a perfect squaren"def even():    print "n is an even numbern"def prime():    print "n is a prime numbern"# map the inputs to the function blocksoptions = {0 : zero,1 : sqr,4 : sqr,9 : sqr,2 : even,3 : prime,5 : prime,7 : prime,}

然后，调用等效的开关块：

options[num]()

如果你严重依赖失败，就会开始崩溃。