Jean-Michel Pichavant wrote:
Hi fellows,
Does anyone know a way to write virtual methods (in one virtual class)
that will raise an exception only if called without being overridden ?
Currently in the virtual method I'm checking that the class of the
instance calling the method has defined that method as well.
Example:
class Stream(object):
"""Interface of all stream objects"""
def resetStats(self):
"""Reset the stream statistics. All values a zeroed except the
date."""
_log.info('Reset statistics of %s' % self)
if self.__class__.resetStats == Stream.resetStats:
raise NotImplementedError()
It works but it's tedious, I have to add these 2 lines to every virtual
method, changing the content of the 2 lines.
Maybe there is a nice/builtin way to do so (python 2.4)
Why are you checking which class it's in? The method in the base class
will be called only if it hasn't been overridden in the subclass.
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