Stefan Behnel schrieb am 06.06.2015 um 22:25: > Neal Becker schrieb am 06.06.2015 um 20:25: >> According to >> https://github.com/cython/cython/blob/master/CHANGES.rst >> >> the default build would attempt to modify python stdlib files? > > No. Glad you asked, that might not be clear. > > It will not modify the *files*, only the content of the modules after > importing them. It adds the missing ABCs to the collections.abc module and > registers Cython's own types with them *at runtime*. Here's what it does: > > https://github.com/cython/cython/blob/bb0dec2/Cython/Utility/Coroutine.c#L1322 > > This is a bit fragile, like all monkey-patching. As long as things get > imported in the right order, it works. But if you import asyncio before a > Cython module that adds the ABCs, it may already have decided that the ABCs > don't exist and won't use them. That's controllable on user application > side, though. > > Also, the first patcher necessarily wins, so if there will ever be updates > to the ABCs, old Cython modules would still patch in the old versions when > imported first. They should tend to be quite stable, though. > > In any case, this will get better over time as more code switches to Py3.5 > and later.
Given the drawbacks above, I decided to extract the ABC patching into a separate PyPI module that users can install themselves to enable interoperability. https://pypi.python.org/pypi/backports_abc I'll remove the ABC patching code from Cython again. Stefan _______________________________________________ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
