Hi all, Today I tested building Sage on Arch against our python3 packages. Not surprisingly, it failed to even start. This is due to our python3 ipython package being at version 7 already, with includes some API changes that require some porting in Sage. More and more python modules are completely dropping python2 support: ipython, sphinx, networkx, scipy, matplotlib... These packages can't be upgraded in sage-the-distribution and are therefore stuck to an old version until python2 support is dropped in Sage, which presumably won't happen for at least a couple of years. This is going to be a big problem for distributions in the period when Sage defaults to Python3 but still supports Python 2: much patching will probably be needed to support the newer versions of python3 modules with are still not upgraded in Sage due to not supporting python2. My first question is: would Sage accept patches to support this newer version of python modules (while still keeping compatibility with the older versions shipped by Sage)?. That would allow to reduce the patching required by distros. However, this would still not be completely satisfactory - the updated version code path would not be tested so the risk of regressions would be quite high. Ideally, Sage should allow to ship different versions for the python2 and python3 versions of these modules, so when compiling with python3 it would use the latest versions. Are there any plans in this direction, or are these packages going to be stuck to old versions until python2 support is dropped?
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