python getattr()

object, name[, default])

Return the value of the named attributed of object. name must be a string. If the string is the name of one of the object's attributes, the result is the value of that attribute. For example, getattr(x, 'foobar') is equivalent to x.foobar. If the named attribute does not exist, default is returned if provided, otherwise AttributeError is raised.

例子：

#!/ usr/bin/ python

#-*- conding utf-8 -*-

class Tests(object):    #定义类

    aaa = '10'          #定义变量

    def test(self):     #定义类的方法test

        b = 20

        return b

if __name__ == "__main__" :

   

    t = Tests()         #实例化

    snap1 = getattr(t, 'test')()         #获取对象中test方法，并执行 

    snap2 = getattr(t, 'aaa' ,'default' )  #获取对象中相应的值，如果没有，则使用default

    snap3 = getattr(t,' bbb', 'default' )  #获取对象中相应的值，如果没有，则使用default

    print 'snap1=',snap1

    print 'snap2=',snap2

    print 'snap3=' ,snap3

输出如下

snap1= 20

snap2= 10

snap3= default