Message10300

Not implementing an abstract method from an abstract class or interface in Java currently raises a NotImplementedError exception. However, it does not specify the offending type, method, or object, which makes debugging extremely difficult.

At the very least, we should provide the same level of detail as AttributeError on objects.

>>> from javax.servlet.http import HttpServletResponse
>>> class MockResponse(HttpServletResponse): pass
...

Compare

>>> x = MockResponse()
>>> x.getOutputStream()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NotImplementedError

vs

>>> x.getBaz()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'MockResponse' object has no attribute 'getBaz'