python 中switch的实现

转载自：http://blog.chinaunix.net/uid-1706385-id-2834875.html

There is currently no switch statement in Python. Often this is not a problem and can be handled through a series of if-elif-else statements. However, there are many other ways to handle the deficiency. The following example shows how to create a simple switch statement in Python:

def a(s):     print s def switch(ch):     try:       {'1': lambda : a("one"),        '2': lambda : a("two"),       '3': lambda : a("three"),        'a': lambda : a("Letter a")       }[ch]()     except KeyError:       a("Key not Found") eg: >>switch('1') one >>switch('a') Letter a >>switch('b') Key not Found