Peter Otten wrote:
Greg Ewing wrote:
This seems to happen even with a custom subclass of tuple,
so it must be doing an exact type check.
No, it doesn't do an exact type check, but always calls the tuple method:
I guess you mean len(). On further investigation,
this seems to be right, except that it doesn't
invoke a __len__ defined in a custom subclass.
So there's something in there hard-coded to
expect a built-in tuple.
In any case, the original idea isn't possible.
--
Greg Ewing, Computer Science Dept,
University of Canterbury,
Christchurch, New Zealand
http://www.cosc.canterbury.ac.nz/~greg
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