Python中Swithch Case语法实现

http://blog.csdn.net/suiyunonghen/article/details/3734135
http://blog.csdn.net/longshengguoji/article/details/9918645
其他语言中，switch语句大概是这样的

switch (var)
{
case value1: do_some_stuff1();
case value2: do_some_stuff2();
...
case valueN: do_some_stuffN();
default: do_default_stuff();
}

而python本身没有switch语句，解决方法有以下3种:
A.使用dictionary
values = {
value1: do_some_stuff1,
value2: do_some_stuff2,
...
valueN: do_some_stuffN,
}
values.get(var, do_default_stuff)()
[b]B.使用lambda
[/b][code]result = {
'a': lambda x: x * 5,
'b': lambda x: x + 7,
'c': lambda x: x - 2
}[value](x)

[b]C.Brian Beck提供了一个类 switch 来实现其他语言中switch的功能
[/b]

# This class provides the functionality we want. You only need to look at
# this if you want to know how this works. It only needs to be defined
# once, no need to muck around with its internals.
class switch(object):
def __init__(self, value):
self.value = value
self.fall = False

def __iter__(self):
"""Return the match method once, then stop"""
yield self.match
raise StopIteration

def match(self, *args):
"""Indicate whether or not to enter a case suite"""
if self.fall or not args:
return True
elif self.value in args: # changed for v1.5, see below
self.fall = True
return True
else:
return False

# The following example is pretty much the exact use-case of a dictionary,
# but is included for its simplicity. Note that you can include statements
# in each suite.
v = 'ten'
for case in switch(v):
if case('one'):
print 1
break
if case('two'):
print 2
break
if case('ten'):
print 10
break
if case('eleven'):
print 11
break
if case(): # default, could also just omit condition or 'if True'
print "something else!"
# No need to break here, it'll stop anyway
[/code]

python中是没用switch语句的，这应该是体现python大道至简的思想，python中一般多用字典来代替switch来实现。

[python]
view plaincopy

#coding: utf-8
from __future__ import division

def jia(x,y):
print x+y

def jian(x,y):
print x-y

def cheng(x,y):
print x*y

def chu(x,y):
print x/y

operator = {'+':jia,'-':jian,'*':cheng,'/':chu}

def f(x,o,y):
operator.get(o)(x,y)

f(3,'+',2)

上面的代码就用字典实现了选择功能，要是在C++中实现上述功能，是用switch实现的，但是用python的字典实现起来更简单