Since the above appears to be a very difficult question (:-), I'm going to
add another one - which is actually mentioned in the thread title, but I
somehow forgot to ask...
Suppose I have a class A with an __init__ method taking a single mandatory
argument:
class A(SageObject):
def __init__(self, a, b=None, c=None):
What I'd like to achieve is that A(a) yields a, if a is an instance of A.
I have read a bit about unique representation and CachedRepresentation,
etc., but what I really want to achieve here is, I hope, much simpler.
I don't want to use CachedRepresentation, since the arguments of __init__
would be expensive to cache.
Many thanks,
Martin
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