urllibcompat: remove Python 2 support code We had to move the `import` statements to appease the import checker. This whole module could probably be deleted as its point in life is to pave over Python 2/3 differences. But that's for a different commit. Differential Revision: https://phab.mercurial-scm.org/D12299

keepalive: remove Python 2 support code Differential Revision: https://phab.mercurial-scm.org/D12298

extensions: remove superfluous pycompat.ispy3 check This is always True now. Differential Revision: https://phab.mercurial-scm.org/D12297

archival: remove check for Python 2 Differential Revision: https://phab.mercurial-scm.org/D12296

encoding: remove Python 2 support code Differential Revision: https://phab.mercurial-scm.org/D12295

dispatch: remove Python 2 function variants Differential Revision: https://phab.mercurial-scm.org/D12294

config: remove conditional asserts We always run on Python 3 now. Differential Revision: https://phab.mercurial-scm.org/D12293

error: unconditionally define __str__ We always run on Python 3 now. Differential Revision: https://phab.mercurial-scm.org/D12292

formatter: remove conditional assert We always run on Python 3 now. Differential Revision: https://phab.mercurial-scm.org/D12291

httppeer: inline simplified _reqdata() The function can be reduced to an attribute lookup on Python 3. So inline it. Differential Revision: https://phab.mercurial-scm.org/D12290

url: remove passing of strict This was needed to support Python 2.7. Differential Revision: https://phab.mercurial-scm.org/D12289

posix: delete Python 2 posixfile() The comment no longer makes sense since the stdlib open() behaves the way we want on Python 3. So it was removed. Differential Revision: https://phab.mercurial-scm.org/D12288

match: delete Python 2 conditional code Differential Revision: https://phab.mercurial-scm.org/D12287

mail: delete conditional code for Python 2 Differential Revision: https://phab.mercurial-scm.org/D12286

archival: remove GzipFileWithTime This was required for Python 2 support, which we no longer need to support. Differential Revision: https://phab.mercurial-scm.org/D12285

check-code: allow importing Python 3 modules Now that we no longer support Python 2, we should be able to import and use the Python 3 only modules in our code. So remove a lint banning this. Differential Revision: https://phab.mercurial-scm.org/D12284

tests: move Python 3.5 check higher in file Per code review comment on the changeset that introduced the Python 3.5+ checks. Differential Revision: https://phab.mercurial-scm.org/D12259

py2: drop some more from __future__ statements These are no longer needed after dropping support for Python 2. Differential Revision: https://phab.mercurial-scm.org/D12258

tests: delete some no-py3 blocks And drop some nearby avoidable py3 checks in close proximity while we are here. Differential Revision: https://phab.mercurial-scm.org/D12257

tests: remove __future__ import from test-debugcommands.t This one is slightly more involved since it affects test output. Differential Revision: https://phab.mercurial-scm.org/D12256

tests: remove from __future__ from inline Python in tests This is no longer required since we require Python 3 and the linter no longer requires these statements. Differential Revision: https://phab.mercurial-scm.org/D12255

py2: remove simple from __future__ statements These were needed for Python 2 support. Now that our linter no longer mandates these, we can start deleting them. Differential Revision: https://phab.mercurial-scm.org/D12254

tests: remove output conditionalized on no-py3 I simply did a search for `^.* \(no-py3 !\)\n` and removed all matched lines. There are still some references to no-py3. But these were the simpler ones to match against. Differential Revision: https://phab.mercurial-scm.org/D12253

py3: use io.BytesIO directly Previously, pycompat.bytesio and pycompat.stringio referred to io.BytesIO. And util.bytesio and util.stringio aliased the pycompat symbols. This commit switches everything to use io.BytesIO directly. util.bytesio and util.stringio still exist to provide backwards compatibility, as they were the preferred symbols. Differential Revision: https://phab.mercurial-scm.org/D12252

check-py3-compat: drop support for Python 2 We no longer support Python 2 so we can drop support for linting code for Python 2 support. This gets rid of the check for `from __future__`, enabling us to delete those imports. Differential Revision: https://phab.mercurial-scm.org/D12251

pycompat: remove large Python 2 block We no longer support Python 2. So we can delete its compatibility code and remove the conditional and dedent the Python 3 code. In order to make the linter happy, we had to inline imports in the stanza at the top of the file. Differential Revision: https://phab.mercurial-scm.org/D12250

py3: use pickle directly pycompat.pickle abstracted over the different pickle modules in Python 2 and 3. Now that we're Python 3 only, it is safe to use the `pickle` module directly. So this commit does that. As part of this we remove the rules from check-code.py that were forbidden direct pickle module use. We retain the `util.pickle` symbol for backwards compatibility, just in case some extensions were using it. Differential Revision: https://phab.mercurial-scm.org/D12249

pycompat: remove first not ispy3 block We now require Python 3. So we can remove the first block supporting Python 2. Differential Revision: https://phab.mercurial-scm.org/D12247

import-checker: assume absolute and use modern import checker Since we require Python 3 now, we can assume we always use absolute imports and the modern import checker should be used. Differential Revision: https://phab.mercurial-scm.org/D12246

tests: unconditionalize some imports Now that we require Python 3 we can simplify these imports. Differential Revision: https://phab.mercurial-scm.org/D12245