[Answered ]-Class based views and 'raise NotImplementedError'

Well, you do it correctly, call raise NotImplementedError() inside the functions that are not implemented and it will get raised every time these functions get called:

>>> class NotImplementedError(Exception):
...     pass
... 
>>> class FooView(object):
...     def get(self):
...         raise NotImplementedError()
... 
>>> v = FooView()
>>> v.get()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in get
__main__.NotImplementedError

You can raise the exception anywhere you deem it useful, e.g. in the constructor to indicate that the whole class is not implemented:

>>> class FooView(object):
...     def __init__(self):
...         raise NotImplementedError()
... 
>>> v = FooView()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __init__
__main__.NotImplementedError