如何在Python中动态类创建后调用父类的__init__方法？

Question

我想从两个基类（ExampleTestRun和Thread）动态创建一个类。主要目的是在线程中启动ExampleTestRun方法“run”（通过调用Thread类的方法“start”）。我从来没有在Python中使用super（）。也许这将是一个答案？

from threading import Thread 

class BaseTest(object): 
    def __init__(self): 
     pass 

class ExampleTestRun(BaseTest): 

    def run(self): 

     try: 
      a = int('A') 
     except Exception as ex: 
      print ex 



if __name__ == "__main__": 

    test_class = type('TestClass', (ExampleTestRun, Thread), {}) 
    test = test_class() 
    test.start() 

我得到错误：

Traceback (most recent call last): 
    File "D:/Dropbox/Workspaces/PyCharmWorkspace/ElgsisTests/src/mcltests/mcltransparent/run.py", line 30, in <module> 
    test.start() 
    File "C:\Python27\lib\threading.py", line 737, in start 
    raise RuntimeError("thread.__init__() not called") 
RuntimeError: thread.__init__() not called 

Answer 1

它监守你​​将覆盖新创建的类的__init__抛出错误。更换该重新定义与pass干脆将修复它：

class BaseTest(object): 
    pass 

当然，如果你想在原来的构造函数展开，你将不得不诉诸super。因此，完整的代码将如下所示：

from threading import Thread 

class BaseTest(object): 
    def __init__(self): 
     super(BaseTest, self).__init__() 

class ExampleTestRun(BaseTest): 

    def run(self): 

     try: 
      a = int('A') 
     except Exception as ex: 
      print ex 

if __name__ == "__main__": 

    test_class = type('TestClass', (ExampleTestRun, Thread), {}) 
    test = test_class() 
    test.start()