tests: unconditionalize bchr We could probably just do bytes([x]) everywhere. But this eliminates use of PYTHON3. Differential Revision: https://phab.mercurial-scm.org/D12238

tests: unconditionalize _unified_diff Now that we're Python 3 only we can make this logic simpler. Differential Revision: https://phab.mercurial-scm.org/D12237

tests: collapse elif PYTHON3 block PYTHON3 is always True now so this logic should be identical as to before. Differential Revision: https://phab.mercurial-scm.org/D12236

tests: collapse some more trivial if PYTHON3 blocks This doesn't account for all of the references to PYTHON3. But it accounts for the ones that are more trivial and don't entail logical changes. Differential Revision: https://phab.mercurial-scm.org/D12235

tests: require Python 3.5+ in run-tests.py We change the version check logic to hard fail if running on <= 3.5.0. The branch for <3.5 has been deleted. And the >=3.5 branch block has been dedented. Differential Revision: https://phab.mercurial-scm.org/D12234

revlog: use rust rank computation if available Differential Revision: https://phab.mercurial-scm.org/D12212

rust: expose rank computation function to python Differential Revision: https://phab.mercurial-scm.org/D12211

rust: implement vcsgraph::RankedGraph for Index Differential Revision: https://phab.mercurial-scm.org/D12210

revlog: implement fast_rank retrieval in C This will be useful in particular to avoid going through the Python interpreter in native Rust functions. Differential Revision: https://phab.mercurial-scm.org/D12209

revlog: return 0 for the fast_rank of nullrev By convention, the rank of the null revision is 0. This particular revision is never "physically" stored in the changelog, so it is a special case. For consistency, the value `None` is still being returned for revlogs which do not store the fast_rank property for any revision. Differential Revision: https://phab.mercurial-scm.org/D12208

setup: drop support for Python 3.5 We talked about this on the mailing list [1] and there seemed to be agreement that Python 3.5 is effectively dead and no longer worth supporting. So this commit changes our minimum version requirement to 3.6.2. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2022-February/147885.html Differential Revision: https://phab.mercurial-scm.org/D12315

packaging: remove requirements constraints to support Python 2 We just deleted support for Python 2 from the packaging code. We no longer need these package constraints in the requirements file to support Python 2. Differential Revision: https://phab.mercurial-scm.org/D12267