On 2007-01-05, Thomas Ploch <[EMAIL PROTECTED]> wrote:
>>> I am writing a class that is intended to be subclassed. What
>>> is the proper way to indicate that a sub class must override a
>>> method?
>>
>> If any subclass *must* override a method, raise
>> NotImplementedError in the base class (apart from documenting
>> how your class is supposed to be used).
>
> I learn so much from this list. I didn't even know this error existed.
And remember: even if it didn't, you could have created your
own:
------------------------------foo.py------------------------------
class NotImplementedError(Exception):
pass
def foo():
print "hi there"
msg = "there's a penguin on the telly!"
raise NotImplementedError(msg)
print "how are you?"
foo()
------------------------------------------------------------------
$ python foo.py
hi there
Traceback (most recent call last):
File "foo.py", line 10, in ?
foo()
File "foo.py", line 7, in foo
raise NotImplementedError(msg)
__main__.NotImplementedError: there's a penguin on the telly!
A few carefully thought-out exceptions can often eliminate the
need for a lot of messy code.
--
Grant Edwards grante Yow! I'll show you MY
at telex number if you show
visi.com me YOURS...
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