Changing the definition of class Nums to
class Nums:
def __getitem__(self, i):
if 0 <= i < 10: return i
raise IndexError
def __len__(self):
return 10
I.e. adding the __len__() method avoids the SystemError.
Either the *arg call should not depend on the sequence being
lenght-able, or it should error check that the length calculation
doesn't return -1 or raise an exception.
Looking at PySequence_Length() though, it seems that m->sq_length(s)
can return -1 without setting a type_error. So the fix is either to
include a check for return -1 in PySequence_Length() when calling
sq_length, or instance_length() should set a TypeError when it has no
__len__() method and returns -1.
I gotta run so I can't follow this through -- I'm sure I'll see the
right solution from someone in tomorrow mornings email :)
-Barry
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