I've downloaded from a supposedly serious source a sage script. It doesn't work on my computer, and a quick debugging showed that a problem came from the fact that at some point, the authors were doing as if a n-element list was numbered from 1 to n (whereas the "normal" numbering in Python and (thus) sage is 0..n-1). What am I missing? Is there a global variable hidden somewhere that changes this convention, like in APL? Continue reading...
