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tests: add test for Python 3 compatibility...
tests: add test for Python 3 compatibility Python 3 is inevitable. There have been incremental movements towards converting the code base to be Python 3 compatible. Unfortunately, we don't have any tests that look for Python 3 compatibility. This patch changes that. We introduce a check-py3-compat.py script whose role is to verify Python 3 compatibility of the files passed in. We add a test that calls this script with all .py files from the source checkout. The script currently only verifies that absolute_import and print_function are used. These are the low hanging fruits for Python compatbility. Over time, we can include more checks, including verifying we're able to load each Python file with Python 3. You have to start somewhere. Accepting this patch means that all new .py files must have absolute_import and print_function (if "print" is used) to avoid a new warning about Python 3 incompatibility. We've already converted several files to use absolute_import and print_function is in the same boat, so I don't think this is such a radical proposition.

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test-check-py3-compat.t
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/ tests / test-check-py3-compat.t
#require test-repo
$ cd "$TESTDIR"/..
$ hg files 'set:(**.py)' | xargs python contrib/check-py3-compat.py
contrib/casesmash.py not using absolute_import
contrib/check-code.py not using absolute_import
contrib/check-code.py requires print_function
contrib/check-config.py not using absolute_import
contrib/check-config.py requires print_function
contrib/debugcmdserver.py not using absolute_import
contrib/debugcmdserver.py requires print_function
contrib/debugshell.py not using absolute_import
contrib/fixpax.py not using absolute_import
contrib/fixpax.py requires print_function
contrib/hgclient.py not using absolute_import
contrib/hgclient.py requires print_function
contrib/hgfixes/__init__.py not using absolute_import
contrib/hgfixes/fix_bytes.py not using absolute_import
contrib/hgfixes/fix_bytesmod.py not using absolute_import
contrib/hgfixes/fix_leftover_imports.py not using absolute_import
contrib/import-checker.py not using absolute_import
contrib/import-checker.py requires print_function
contrib/memory.py not using absolute_import
contrib/perf.py not using absolute_import
contrib/python-hook-examples.py not using absolute_import
contrib/revsetbenchmarks.py not using absolute_import
contrib/revsetbenchmarks.py requires print_function
contrib/showstack.py not using absolute_import
contrib/synthrepo.py not using absolute_import
contrib/win32/hgwebdir_wsgi.py not using absolute_import
doc/check-seclevel.py not using absolute_import
doc/gendoc.py not using absolute_import
doc/hgmanpage.py not using absolute_import
hgext/__init__.py not using absolute_import
hgext/acl.py not using absolute_import
hgext/blackbox.py not using absolute_import
hgext/bugzilla.py not using absolute_import
hgext/censor.py not using absolute_import
hgext/children.py not using absolute_import
hgext/churn.py not using absolute_import
hgext/clonebundles.py not using absolute_import
hgext/color.py not using absolute_import
hgext/convert/__init__.py not using absolute_import
hgext/convert/bzr.py not using absolute_import
hgext/convert/common.py not using absolute_import
hgext/convert/convcmd.py not using absolute_import
hgext/convert/cvs.py not using absolute_import
hgext/convert/cvsps.py not using absolute_import
hgext/convert/darcs.py not using absolute_import
hgext/convert/filemap.py not using absolute_import
hgext/convert/git.py not using absolute_import
hgext/convert/gnuarch.py not using absolute_import
hgext/convert/hg.py not using absolute_import
hgext/convert/monotone.py not using absolute_import
hgext/convert/p4.py not using absolute_import
hgext/convert/subversion.py not using absolute_import
hgext/convert/transport.py not using absolute_import
hgext/eol.py not using absolute_import
hgext/extdiff.py not using absolute_import
hgext/factotum.py not using absolute_import
hgext/fetch.py not using absolute_import
hgext/gpg.py not using absolute_import
hgext/graphlog.py not using absolute_import
hgext/hgcia.py not using absolute_import
hgext/hgk.py not using absolute_import
hgext/highlight/__init__.py not using absolute_import
hgext/highlight/highlight.py not using absolute_import
hgext/histedit.py not using absolute_import
hgext/keyword.py not using absolute_import
hgext/largefiles/__init__.py not using absolute_import
hgext/largefiles/basestore.py not using absolute_import
hgext/largefiles/lfcommands.py not using absolute_import
hgext/largefiles/lfutil.py not using absolute_import
hgext/largefiles/localstore.py not using absolute_import
hgext/largefiles/overrides.py not using absolute_import
hgext/largefiles/proto.py not using absolute_import
hgext/largefiles/remotestore.py not using absolute_import
hgext/largefiles/reposetup.py not using absolute_import
hgext/largefiles/uisetup.py not using absolute_import
hgext/largefiles/wirestore.py not using absolute_import
hgext/mq.py not using absolute_import
hgext/notify.py not using absolute_import
hgext/pager.py not using absolute_import
hgext/patchbomb.py not using absolute_import
hgext/purge.py not using absolute_import
hgext/rebase.py not using absolute_import
hgext/record.py not using absolute_import
hgext/relink.py not using absolute_import
hgext/schemes.py not using absolute_import
hgext/share.py not using absolute_import
hgext/shelve.py not using absolute_import
hgext/strip.py not using absolute_import
hgext/transplant.py not using absolute_import
hgext/win32mbcs.py not using absolute_import
hgext/win32text.py not using absolute_import
hgext/zeroconf/Zeroconf.py not using absolute_import
hgext/zeroconf/Zeroconf.py requires print_function
hgext/zeroconf/__init__.py not using absolute_import
i18n/check-translation.py not using absolute_import
i18n/polib.py not using absolute_import
mercurial/byterange.py not using absolute_import
mercurial/cmdutil.py not using absolute_import
mercurial/commands.py not using absolute_import
mercurial/commandserver.py not using absolute_import
mercurial/context.py not using absolute_import
mercurial/destutil.py not using absolute_import
mercurial/dirstate.py not using absolute_import
mercurial/dispatch.py requires print_function
mercurial/encoding.py not using absolute_import
mercurial/exchange.py not using absolute_import
mercurial/help.py not using absolute_import
mercurial/httpclient/__init__.py not using absolute_import
mercurial/httpclient/_readers.py not using absolute_import
mercurial/httpclient/socketutil.py not using absolute_import
mercurial/httpconnection.py not using absolute_import
mercurial/keepalive.py not using absolute_import
mercurial/keepalive.py requires print_function
mercurial/localrepo.py not using absolute_import
mercurial/lsprof.py requires print_function
mercurial/lsprofcalltree.py not using absolute_import
mercurial/lsprofcalltree.py requires print_function
mercurial/mail.py requires print_function
mercurial/manifest.py not using absolute_import
mercurial/mdiff.py not using absolute_import
mercurial/obsolete.py not using absolute_import
mercurial/patch.py not using absolute_import
mercurial/pure/__init__.py not using absolute_import
mercurial/pure/base85.py not using absolute_import
mercurial/pure/bdiff.py not using absolute_import
mercurial/pure/diffhelpers.py not using absolute_import
mercurial/pure/mpatch.py not using absolute_import
mercurial/pure/osutil.py not using absolute_import
mercurial/pure/parsers.py not using absolute_import
mercurial/pvec.py not using absolute_import
mercurial/py3kcompat.py not using absolute_import
mercurial/revlog.py not using absolute_import
mercurial/scmposix.py not using absolute_import
mercurial/scmutil.py not using absolute_import
mercurial/scmwindows.py not using absolute_import
mercurial/similar.py not using absolute_import
mercurial/store.py not using absolute_import
mercurial/util.py not using absolute_import
mercurial/windows.py not using absolute_import
setup.py not using absolute_import
tests/autodiff.py not using absolute_import
tests/dumbhttp.py not using absolute_import
tests/fakedirstatewritetime.py not using absolute_import
tests/fakepatchtime.py not using absolute_import
tests/filterpyflakes.py not using absolute_import
tests/filterpyflakes.py requires print_function
tests/generate-working-copy-states.py not using absolute_import
tests/generate-working-copy-states.py requires print_function
tests/get-with-headers.py not using absolute_import
tests/get-with-headers.py requires print_function
tests/heredoctest.py not using absolute_import
tests/heredoctest.py requires print_function
tests/hghave.py not using absolute_import
tests/hgweberror.py not using absolute_import
tests/hypothesishelpers.py not using absolute_import
tests/hypothesishelpers.py requires print_function
tests/killdaemons.py not using absolute_import
tests/md5sum.py not using absolute_import
tests/mockblackbox.py not using absolute_import
tests/printenv.py not using absolute_import
tests/readlink.py not using absolute_import
tests/readlink.py requires print_function
tests/revlog-formatv0.py not using absolute_import
tests/run-tests.py not using absolute_import
tests/seq.py not using absolute_import
tests/seq.py requires print_function
tests/silenttestrunner.py not using absolute_import
tests/silenttestrunner.py requires print_function
tests/sitecustomize.py not using absolute_import
tests/svn-safe-append.py not using absolute_import
tests/svnxml.py not using absolute_import
tests/test-ancestor.py not using absolute_import
tests/test-ancestor.py requires print_function
tests/test-atomictempfile.py not using absolute_import
tests/test-batching.py not using absolute_import
tests/test-batching.py requires print_function
tests/test-bdiff.py not using absolute_import
tests/test-bdiff.py requires print_function
tests/test-context.py not using absolute_import
tests/test-context.py requires print_function
tests/test-demandimport.py not using absolute_import
tests/test-demandimport.py requires print_function
tests/test-dispatch.py not using absolute_import
tests/test-dispatch.py requires print_function
tests/test-doctest.py not using absolute_import
tests/test-duplicateoptions.py not using absolute_import
tests/test-duplicateoptions.py requires print_function
tests/test-filecache.py not using absolute_import
tests/test-filecache.py requires print_function
tests/test-filelog.py not using absolute_import
tests/test-filelog.py requires print_function
tests/test-hg-parseurl.py not using absolute_import
tests/test-hg-parseurl.py requires print_function
tests/test-hgweb-auth.py not using absolute_import
tests/test-hgweb-auth.py requires print_function
tests/test-hgwebdir-paths.py not using absolute_import
tests/test-hybridencode.py not using absolute_import
tests/test-hybridencode.py requires print_function
tests/test-lrucachedict.py not using absolute_import
tests/test-lrucachedict.py requires print_function
tests/test-manifest.py not using absolute_import
tests/test-minirst.py not using absolute_import
tests/test-minirst.py requires print_function
tests/test-parseindex2.py not using absolute_import
tests/test-parseindex2.py requires print_function
tests/test-pathencode.py not using absolute_import
tests/test-pathencode.py requires print_function
tests/test-propertycache.py not using absolute_import
tests/test-propertycache.py requires print_function
tests/test-revlog-ancestry.py not using absolute_import
tests/test-revlog-ancestry.py requires print_function
tests/test-run-tests.py not using absolute_import
tests/test-simplemerge.py not using absolute_import
tests/test-status-inprocess.py not using absolute_import
tests/test-status-inprocess.py requires print_function
tests/test-symlink-os-yes-fs-no.py not using absolute_import
tests/test-trusted.py not using absolute_import
tests/test-trusted.py requires print_function
tests/test-ui-color.py not using absolute_import
tests/test-ui-color.py requires print_function
tests/test-ui-config.py not using absolute_import
tests/test-ui-config.py requires print_function
tests/test-ui-verbosity.py not using absolute_import
tests/test-ui-verbosity.py requires print_function
tests/test-url.py not using absolute_import
tests/test-url.py requires print_function
tests/test-walkrepo.py not using absolute_import
tests/test-walkrepo.py requires print_function
tests/test-wireproto.py not using absolute_import
tests/test-wireproto.py requires print_function
tests/tinyproxy.py not using absolute_import
tests/tinyproxy.py requires print_function