andrew cooke wrote:
Is there a way to make this work (currently scope and join are
undefined at runtime when the inner class attributes are defined):
class _StreamFactory(object):
@staticmethod
def __call__(lines, source, join=''.join):
class Line(object):
__source = source
__join = join
[...]
It would be helpful if you were to describe the type of behavior you expect.
I assume you will return the newly created Line class when you call an
instance of _StreamFactory? There may be some things about the above
that you might be overlooking:
1. __call__ does not supersede the __init__ constructor of _StreamFactory.
2. __source and __join are name-mangled in later versions of python.
They will be attributes of the returned Line class named _Line_source
and _Line_join respectively.
Rather than make _StreamFactory a class, you will probably get the
behavior you desire if you simply make it a function:
def stream_factory:
class Line(object):
__source = source
__join = join
# etc.
return Line
And then don't forget that double underscores produce name mangling and
you'll be set.
James
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