R. David Murray added the comment:

You did request a tuple:

  r = a - q * b,

That is equivalent to

  r = (a - q * b,)

which is a single element tuple.

I had to put in some print statements in your loop to find that, it wasn't 
obvious.  This is perhaps a disadvantage of Python's tuple notation, but the 
benefits of the notation outweigh this small disadvantage, I think.

nosy: +r.david.murray
resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed
type: crash -> behavior

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