python利用字典保存配置实现动态调用模块类方法

#coding=UTF-8

class TestClass:
    def sub(self,a,b):
        return a-b
    def add(self,a,b):
        return a+b
    def chen(self,a,b):
        return a*b

class TestClassA:
    def sub(self,a,b):
        return a-b
    def add(self,a,b):
        return a+b
    def chen(self,a,b):
        return a*b
    
class TestClassB:
    def sub(self,a,b):
        return a-b
    def add(self,a,b):
        return a+b
    def chen(self,a,b):
        return a*b

        
        
sys_config={}
sys_config["01"]=['mytest','TestClassA','add']
sys_config["02"]=['mytest','TestClassA','sub']
sys_config["03"]=['mytest','TestClassA','chen']
sys_config["04"]=['mytest','TestClassB','add']
sys_config["05"]=['mytest','TestClassB','sub']
sys_config["06"]=['mytest','TestClassB','chen']

def main():
    class_name = "TestClass" #类名
    module_name = "mytest"   #模块名
    method = "chen"          #方法名

    module = __import__(module_name) # import module
    print "#module:",module
    c = getattr(module,class_name)  
    print "#c:",c
    obj = c() # new class
    print "#obj:",obj
    print(obj)
    obj.chen(2,3)
    mtd = getattr(obj,method)
    print "#mtd:",mtd
    print mtd(2,3) # call def
    
    mtd_add = getattr(obj,"add")
    t=mtd_add(1,2)
    print "#t:",t

    mtd_sub = getattr(obj,"sub")
    print mtd_sub(2,1)
    
    
    ywdm='02'
    
    my_module_name=sys_config[ywdm][0]
    my_class_name=sys_config[ywdm][1]
    my_method_name=sys_config[ywdm][2]
    
    my_module = __import__(my_module_name)
    my_class = getattr(my_module,my_class_name) 
    my_obj = my_class() 
    my_method = getattr(my_obj,my_method_name)
    
    print my_method(5,2)
    
    
    
    
    
    
    
    
  
    

if __name__ == '__main__':
   main()