[Python-Dev] Recent changes to PyCodeObject

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

Thanks, I should have searched :)


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