Re: [Python-Dev] Recent changes to PyCodeObject

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

On Wed, Nov 16, 2016 at 6:18 PM, Ned Batchelder 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 co_firstlineno field in PyCodeObject moved in September, as part of the PEP 523 work: https://github.com/python/cpython/commit/f1e6d88b3ca2b56d51d87b6b38ea1870c5d...

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 co_extra to the struct: https://mail.python.org/pipermail/python-dev/2016-August/145961.html

Thanks, I should have searched :) --Ned.