Hello,

There is an annoying difference between gap and libgap with respect to indexing: gap indices start at 1 and libgap indices start at 0...

sage: l0 = libgap.List([1,2,3])
sage: l1 = gap.List([1,2,3])
sage: l0[0]
1
sage: l1[1]
1

The behavior of gap interface respects the gap behavior while the libgap interface respects the Python behavior.

1) I think that the conventions for gap and libgap should be the same

2) I am in favor at starting with 1

I opened #18158 for that. Please tell me what you think either on this thread or on the ticket.

Cheers,
Vincent

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