[Python-Dev] Recent changes to PyCodeObject (original) (raw)

Ned Batchelder ned at nedbatchelder.com
Thu Nov 17 10:54:13 EST 2016

On 11/17/16 10:09 AM, Cody Piersall wrote:

On Wed, Nov 16, 2016 at 6:18 PM, Ned Batchelder <ned at nedbatchelder.com> wrote:

When I added Python 3.6 support to coverage.py, I posted a Mac wheel to PyPI: https://pypi.python.org/pypi/coverage/ That wheel was built against 3.6a3, the latest version at the time. When I use it now on 3.6b3, it doesn't work right. The reason is that the cofirstlineno field in PyCodeObject moved in September, as part of the PEP 523 work: https://github.com/python/cpython/commit/f1e6d88b3ca2b56d51d87b6b38ea1870c5d9490c

The docs say that PyCodeObject can change at any time, but I don't see why the field had to move in the first place. Was this needed? Christian Heimes had the idea so that memory consumption wouldn't be impacted by adding coextra to the struct: https://mail.python.org/pipermail/python-dev/2016-August/145961.html

Thanks, I should have searched :)

--Ned.

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