It seems very likely that we'll want to release Stretch with python3.5 as the default and only python3 version. To do that, we'll need three transitions for python3 extensions (arch all python3 modules don't (with one exception) need to be touched for these transitions):
1. Add python3.5 as a supported python3 version (there is a python3-defaults in experimental that has this enabled for testing). This involves rebuilding all extensions that build-dep on python3-all-dev to support python3 3.4 and 3.5. 2. Make python3.5 the default python3 version. Rebuild extensions that build-dep on python3-dev. 3. Drop python3.4 as a supported python3 version. This involved rebuilding the same packages as the first one. For packages that build fine with python3.5, there should be nothing required from a maintainer point of view. Except pycxx this can all be done with binNMUs. Ubuntu has already done this transition and has patches for a number of packages that may be of assistance when working through issues. Python3 3.5.0-1 is in unstable. I'm going to ask the release team for permission to start the first transition once it gets to testing. The only impact (other than the aforementioned python3.5 specific build issues) will be transient build-dep uninstallabliity in the higher levels of the transition stack until the lower levels are rebuilt. Scott K
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