[Python-Dev] 64 bit warnings

"Martin v. Löwis" martin at v.loewis.de
Thu May 3 00:12:10 CEST 2007

> Any thoughts?

These should be fixed on a case-by-case basis. Please submit patches
to SF, and assign them to me. Changes should only go into 2.6.

As a principle, values that could exceed 2Gi in a hand-crafted Python
program should be Py_ssize_t. Values that can never exceed the int
range (because of other constraints, such as limitations of the byte
code) should be safe-downcast to int (or smaller).

In the particular case of PyEval_EvalCodeEx, I think most values
can't grow beyond 2**31 because the byte code format wouldn't
allow such indexes. There should be documentation on what the valid
ranges are for argcount, kwcount, locals, and what the rationale
for these limitations are, and then they should get a consistent


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