我正在实现一个python类,它在构造函数中构造另一个对象,其类型是根据传递给它的参数确定的。例如,在下面的代码中,"workerA"
具有类"MyAClass"
的行为,"workerB"
对象具有{
我使用这个方法而不是从基类派生不同的类,因为基类已经在另一个无法更改的代码中使用。因此,如果我希望基类的另一个行为与"MyBClass"
行为一样,那么我只需要将参数dbtype = "MyBClass"
传递给它。在
有没有更好的方法可以用来得到同样的结果?在
import sys
# MyAClass definition
class MyAClass :
def __init__(self, serverSettings):
self._serverSettings = serverSettings
def initialize(self):
self._init = 1;
print("Calling", sys._getframe(1).f_code.co_name)
def add(self):
self._init = 2;
print("Calling", sys._getframe(1).f_code.co_name)
def finalize(self):
self._init = 3;
print("Calling", sys._getframe(1).f_code.co_name)
def __del__(self):
print('Calling destructor of class ', self.__class__.__name__)
# MyBClass definition
class MyBClass :
def __init__(self, serverSettings):
self._serverSettings = serverSettings
def initialize(self):
self._init = 1;
print("Calling", sys._getframe(1).f_code.co_name)
def add(self):
self._init = 2;
print("Calling", sys._getframe(1).f_code.co_name)
def finalize(self):
self._init = 3;
print("Calling", sys._getframe(1).f_code.co_name)
def __del__(self):
print('Calling destructor of class ', self.__class__.__name__)
# The base class which will be called in main program
class BaseClass :
def __init__(self, serverSettings, dbtype = None):
if(dbtype == None):
self.__worker = MyAClass(serverSettings)
elif(dbtype == "MyBClass") :
self.__worker = MyBClass(serverSettings)
else :
print("Undefined type")
def initialize(self):
self.__worker.initialize()
def add(self):
self.__worker.add()
def finalize(self):
self.__worker.finalize()
if __name__ == "__main__":
serverSettings = dict()
serverSettings["address"] = "localhost"
serverSettings["name"] = "Testname"
workerA = BaseClass(serverSettings)
workerA.add()
workerB = BaseClass(serverSettings, dbtype = "MyBClass")
workerB.finalize()
我知道这不会产生和你原来的程序一样的输出,但是这样的东西对你有用吗?除非查询方法名(如上所述),否则应该得到功能相同的结果。在
或者,使用像这样的类抖动:
^{pr2}$根据这些建议,我做了以下代码更改
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