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How to use NotImplementedError in Python programming_python
How to use NotImplementedError in Python programming_python
下面为大家分享一篇Python编程中NotImplementedError的使用方法，具有很好的参考价值，希望对大家有所帮助。一起过来看看吧
Python编程中raise可以实现报出错误的功能，而报错的条件可以由程序员自己去定制。在面向对象编程中，可以先预留一个方法接口不实现，在其子类中实现。
如果要求其子类一定要实现，不实现的时候会导致问题，那么采用raise的方式就很好。
而此时产生的问题分类是NotImplementedError。
写一段代码如下：
class ClassDemo:
def test_demo(self):
raiseNotImplementedError("my test: not implemented!")
classChildClass(ClassDemo):
pass
inst =ChildClass()
inst.test_demo()程序运行结果：
E:\01_workspace\02_programme_language\03_python\OOP\2017\08\10>pythonerror_demo.py
Traceback (mostrecent call last):
File "error_demo.py", line 9, in<module>
inst.test_demo()
File "error_demo.py", line 3, intest_demo
raise NotImplementedError("my test:not implemented!")
NotImplementedError:my test: not implemented!从上面的运行结果可以看出，程序识别到了这个方法并没有在子类中实现却被调用了。
从代码报错的行数来看，只有这个子类的实例化对象调用相应的方法的时候才会报错。
这样的推测结论也很容易通过代码修改测试得到验证，此处不再验证。
进一步修改代码：
class ClassDemo:
def test_demo(self):
raiseNotImplementedError("my test: not implemented!")
classChildClass(ClassDemo):
def test_demo(self):
print("OKOKOOK!")
inst =ChildClass()
inst.test_demo()在新的代码中，子类中实现了对test_demo方法的设计。
程序的运行结果如下：
E:\01_workspace\02_programme_language\03_python\OOP\2017\08\10>pythonerror_demo.py OKOKOOK!
从程序的执行结果可以看出，只要相应的方法接口进行了实现，在执行的时候未实施的错误便不会报出。
相关推荐：
详解Python中内置的NotImplemented类型的用法
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