On 10/19/2016 09:04 PM, Elliot Gorokhovsky wrote:
A quick note:
I'm working on a special-case compare function for bounded integers for
the sort stuff. By looking at the implementation, I figured out that
Py_SIZE of a long is the sign times the number of digits (...right?).
Before looking at the implementation, though, I had looked for this info
in the docs, and I couldn't find it anywhere. Since Py_SIZE is public, I
think the documentation should make clear what it returns for PyLongs,
for example somewhere on the "Integer Objects" page. Apologies if this
is specified somewhere else in the docs and I just couldn't find it.
Elliot
I don't think this is right.
https://github.com/python/cpython/blob/master/Include/object.h#L119
https://docs.python.org/3/c-api/structures.html#c.Py_SIZE
https://docs.python.org/3/c-api/structures.html#c.PyVarObject
It returns the `ob_size` fields of a PyVarObject. I think this has to do
with objects with variable sizes like lists. PyLongs are not
PyVarObjects because they have no notion of length.
Why would a long be stored as a sequence of digits instead of a (say) 64
bit integer as 8 bytes?
Cheers,
Thomas
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