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Python中实现结构相似的函数调用方法

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Release: 2016-06-10 15:17:31
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python的dict用起来很方便,可以自定义key值,并通过下标访问,示例如下:

复制代码 代码如下:

>>> d = {'key1':'value1',
... 'key2':'value2',
... 'key3':'value3'}
>>> print d['key2']
value2
>>>

lambda表达式也是很实用的东东,示例如下:
复制代码 代码如下:

>>> f = lambda x : x**2
>>> print f(2)
4
>>>

两者结合可以实现结构相似的函数调用,使用起来很方便,示例如下:

示例一:不带参数 

复制代码 代码如下:

#! /usr/bin/python
 
msgCtrl = "1 : pause\n2 : stop\n3 : restart\nother to quit\n"
 
ctrlMap = {
'1':    lambda : doPause(),
'2':    lambda : doStop(),
'3':    lambda : doRestart()}
 
def doPause():
        print 'do pause'
 
def doStop():
        print 'do stop'
 
def doRestart():
        print 'do restart'
 
if __name__ == '__main__':
        while True:
                print msgCtrl
                cmdCtrl = raw_input('Input : ')
                if not ctrlMap.has_key(cmdCtrl):break
                ctrlMap[cmdCtrl]()

示例二:带参数

复制代码 代码如下:

#! /usr/bin/python
 
msgCtrl = "1 : +\n2 : -\n3 : *\nother to quit\n"
 
ctrlMap = {
'1':    lambda x,y : x+y,
'2':    lambda x,y : x-y,
'3':    lambda x,y : x*y}
 
 
if __name__ == '__main__':
        while True:
                print msgCtrl
                cmdCtrl = raw_input('Input : ')
                if not ctrlMap.has_key(cmdCtrl):break
                print ctrlMap[cmdCtrl](10,2),"\n"
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