We have several threads in issues and pull requests related to Python 3 compatibility. We need a task list to keep in sync and to show our progress

• test: Fix Python unittests in ./test and ./tools test: Fix Python unittests in ./test and ./tools #30340
• tools: pull xcode_emulation.py fixes from node-gyp tools: pull xcode_emulation.py fixes from node-gyp #30272
• deprecated python3 "imp" module used in tools/test.py deprecated python3 module "imp" used in tools/test.py #29418 Fixed in tools: fix Python 3 deprecation warning in test.py #30208 ?
• Build: No module named 'distutils.spawn' Build: No module named 'distutils.spawn' #30189
• v8: load_objects_from_file() using utf-8 v8: load_objects_from_file() using utf-8 #30218
  • upstream to v8 https://chromium-review.googlesource.com/c/v8/v8/+/1895560
• tools: check-imports using utf-8 tools: check-imports using utf-8 #30220
• gyp_round_trip I: Release nodejs/node-gyp@5.x --> npm-cli --> /deps/npm
  • node-gyp: Decode stdout on Python 3 (Decode stdout on Python 3 node-gyp#1890)
  • node-gyp: release v5.0.4 so that npm can pick it up (Release proposal: v5.0.4 node-gyp#1893)
  • npm/cli: node gyp 5.0.5 (node gyp 5.0.4 npm/cli#260)
  • re-vendor npm-cli back into nodejs/node /deps/npm deps: update npm to 6.12.0 #29885
• pull non-travis code out of build: test Python 3.7 on Travis CI #29451 and PR it (test: debug output for dlopen-ping-pong test #29818)
• build: Switch Travis tests to use Python 3 explicitly for configure/build/test, existing CI will continue to use Python 2 (build: test Python 3.7 on Travis CI #29451 )
• tap2junit update to support py3
• tap2junit import into nodejs org, blocked on: Update tap13 from upstream, reapply py3 compatibility PR tap2junit#18 (comment) (Update tap13 from upstream, reapply py3 compat again tap2junit#19)
• build: allow Python 3.8 build: allow Python 3.8 #30194
• node: find and use Python 3.x before Python 2.x: discussion landed on master
• node-gyp: release 6.x preferring Python 3: Release proposal: v6.0.0 node-gyp#1892
• node: tools: fix Python 3 syntax error in mac_tool.py tools: fix Python 3 syntax error in mac_tool.py #30146

• tools: py3 nodedownload.py tools: make nodedownload.py Python 3 compatible #29104
• v8: py3 gen-postmortem-metadata.py deps: V8: cherry-pick e3d7f8a #29105 (landed upstream in v8)
• build: py3 configure.py build: py3 configure.py #29106
• pseudo-tty tests don't run with py 3 tools: make pty_helper.py python3-compatible #29167
• gyp: cherrypick python3 changes to input.py from node-gyp gyp: cherrypick python3 changes to input.py from node-gyp #29140
• build: add Python 3 tests to Travis CI build: add Python 3 tests to Travis CI  #29196 (or build: try GitHub Actions CI for running tests #29193)
• tools: fix Python 3 issues in gyp/generator/make.py tools: fix Python 3 issues in gyp/generator/make.py #29214
• tools: fix Python 3 issues in tools/icu/icutrim.py tools: fix Python 3 issues in tools/icu/icutrim.py #29213
• v8: fix mixup with bytes.decode() and str.encode() tools: fix mixup with bytes.decode() and str.encode() #29208
• tools: fix Python 3 issues in inspector_protocol tools: fix Python 3 issues in inspector_protocol #29296
• test: use print() function in both Python 2 and 3 test: use print() function in both Python 2 and 3 #29298
• Accept Python 3 on Windows Accept Python 3 on Windows #29236
• build: test Python 3.6 and 3.7 on Travis CI build: test Python 3.6 and 3.7 on Travis CI #29291
• tools: from io import StringIO in ninja.py tools: from io import StringIO in ninja.py  #29371
• tools: fix GYP ninja generator for Python 3 tools: fix GYP ninja generator for Python 3 #29416
• build,win: fix Python detection on localized OS build,win: fix Python detection on localized OS #29423
• build: add comment to .travis.yml on how to test Py3 build: add comment to .travis.yml on how to test Py3 #29473
• tools/test.py is not yet Python 3 compatible tools/test.py is not yet Python 3 compatible #29246
• build: find Python 3 or Python 2 in configure build: find Python 3 or Python 2 in configure #25878 modifies ./configure to prefer py2 to py3 See: https://github.com/cclauss/node-configure
• 'async' is a reserved word in Python >= 3.7 'async' is a reserved word in Python >= 3.7 #29326
  • https://chromium-review.googlesource.com/c/deps/inspector_protocol/+/1781351
  • deps: need to cherrypick async fix into inspector code generator deps: need to cherrypick async fix into inspector code generator #29548
  • tools: python3 compat for inspector code generator tools: python3 compat for inspector code generator #29340
• tap2junit: Python 3 changes plus automated testing Python 3 changes plus automated testing tap2junit#5
• tap2junit: v0.1.5 release (tap2junit v0.1.5 proposal tap2junit#12) to the Python Packaging Index PyPI
• node-gyp: Accept Python 3 by default (semver-major) Accept Python 3 by default node-gyp#1844
• node-gyp: doc: Declare that node-gyp is Python 3 compatible doc: Declare that node-gyp is Python 3 compatible node-gyp#1811

• node-test-commit-v8-linux is perma red: V8 CI is not Python 3 compatible #30152
• gyp_round_trip_II: Release nodejs/node-gyp@6.x (prefers py3 over py2) --> npm-cli --> /deps/npm
  • node-gyp: Release proposal: node-gyp@6.0.1 Release proposal: node-gyp@6.0.1 node-gyp#1935
  • node-gyp: npm-cli update and release Release 6.13.0 npm/cli#276 ??
  • node-gyp: npm-cli revendor into deps/npm
• node: backport build: prefer python 3 over 2 for configure #30091 to 13.x
• node: backport build: prefer python 3 over 2 for configure #30091 to 12.x?
• Watch our CI.... see QA
• Add Python 3.8 to Travis CI when Travis' pyenv is updated.
• win: change to use Python in install tool #31221

QA:: Our CI machines are mix of machines that have Python 2, have Python 3, have both, have a python symlink, have it not, etc. By preferring Python 3 in configure/make/test some set of our current machines will start to test against Python 3, but many will continue to test against Python 2. The more modern machines will use 3, as will our users running more up-to-date operating systems in the next year.

Upstream V8 issues:

Neither Chromium or depot_tools are Python 3 compatible yet. This doesn't effect the main Node.js builds, but does affect our V8 integration builds, where v8 is built and tested.

• migration of Chromium to Python 3: https://bugs.chromium.org/p/chromium/issues/detail?id=942720
• specific one for depot_tools: https://bugs.chromium.org/p/chromium/issues/detail?id=984182

Miscellaneous non-blocking cleanups

• Tests do not test ./configure --ninja Tests do not test ./configure --ninja #29415 reopened
• Travis CI does not test ./configure --ninja test test: adding test for configure ninja #30033 reverted
• configure.py: upgrade from optparse to argparse build: replace optparse for argparse in configure.py #29814
• sort((MSVSFolder, MSVSProject)) node-gyp Python 3 support node-addon-api#445 (comment)
• sort out the home for tap2junit: Transfer jenkins CI tool tap2junit into Node.js org admin#413
• investigate using nodejs/node-gyp:gyp/ as up-stream for nodejs/node:tools/gyp/, see The GYP issue: where, how and who to maintain node-gyp#1791 for more information and alternate proposals.

Please use the "python" label!

• Issues with a Python label

• Pull requests with a Python label

• node-gyp pull requests with a Python label