FAQ

Bruno Desthuilliers wrote:
Frank Millman wrote:
bearophileHUGS at lycos.com wrote:
There aren't abstract classes in Python. They are all
concrete.
(snip)
I use the term 'abstract class' in the abstract sense :-)

Say I have three classes where 90% of the attributes and methods are
common. It makes sense to create a base class with these attributes and
methods, and turn each of the three classes into a subclass which
inherits from the base class and overrides the bits that are unique to
each one.

This is what I call an abstract class. Maybe there is a more correct
term.
Depends if instanciating this base class would make any sense.
It would not make sense, no.

I have not gone to the trouble of raising NotImplementedError - the
methods that the subclasses *must* override just have a 'pass'
statement. I guess it would be more correct to raise the error, as it
would give me a quicker indication of an error if I happened to omit
one, but in practice I would find out pretty quickly anyway.

Frank

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postedSep 8, '06 at 7:03a
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