[py3] Remove PYTHON_VERSION_COMPATIBILITY

It's no longer necessary ("py3" is implied) now that we set "py3_only"
in recipes.cfg.

Change-Id: I258809edba6c437141a38116032929daa01ab7e8
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/32143
Commit-Queue: Rob Mohr <mohrr@google.com>
Reviewed-by: Keyong Han <keyonghan@google.com>
diff --git a/recipe_modules/adhoc_validation/__init__.py b/recipe_modules/adhoc_validation/__init__.py
index f65b98d..80ac1c5 100644
--- a/recipe_modules/adhoc_validation/__init__.py
+++ b/recipe_modules/adhoc_validation/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/firebase',
     'flutter/flutter_deps',
diff --git a/recipe_modules/adhoc_validation/examples/full.expected/invalid_validation.json b/recipe_modules/adhoc_validation/examples/full.expected/invalid_validation.json
index 4a519a4..d298e25 100644
--- a/recipe_modules/adhoc_validation/examples/full.expected/invalid_validation.json
+++ b/recipe_modules/adhoc_validation/examples/full.expected/invalid_validation.json
@@ -17,7 +17,7 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/adhoc_validation/examples/full.py\", line 25, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/adhoc_validation/examples/full.py\", line 23, in RunSteps",
       "    api.adhoc_validation.run('Docs', validation, {}, {})",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/adhoc_validation/api.py\", line 36, in run",
       "    raise AssertionError(msg)",
diff --git a/recipe_modules/adhoc_validation/examples/full.py b/recipe_modules/adhoc_validation/examples/full.py
index 2bc6ad9..038cfe8 100644
--- a/recipe_modules/adhoc_validation/examples/full.py
+++ b/recipe_modules/adhoc_validation/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/adhoc_validation',
     'flutter/repo_util',
diff --git a/recipe_modules/android_virtual_device/__init__.py b/recipe_modules/android_virtual_device/__init__.py
index 318dbc5..1fbcbc7 100644
--- a/recipe_modules/android_virtual_device/__init__.py
+++ b/recipe_modules/android_virtual_device/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'flutter/test_utils',
diff --git a/recipe_modules/android_virtual_device/examples/full.py b/recipe_modules/android_virtual_device/examples/full.py
index 59cfc44..b929748 100644
--- a/recipe_modules/android_virtual_device/examples/full.py
+++ b/recipe_modules/android_virtual_device/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/android_virtual_device',
     'recipe_engine/path',
diff --git a/recipe_modules/bucket_util/__init__.py b/recipe_modules/bucket_util/__init__.py
index 5d669a1..c7e7d23 100644
--- a/recipe_modules/bucket_util/__init__.py
+++ b/recipe_modules/bucket_util/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gsutil',
diff --git a/recipe_modules/bucket_util/examples/full.py b/recipe_modules/bucket_util/examples/full.py
index baf93a7..4863dbf 100644
--- a/recipe_modules/bucket_util/examples/full.py
+++ b/recipe_modules/bucket_util/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import DropExpectation
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/bucket_util',
     'flutter/zip',
diff --git a/recipe_modules/build_util/__init__.py b/recipe_modules/build_util/__init__.py
index 9d1b4a3..0add518 100644
--- a/recipe_modules/build_util/__init__.py
+++ b/recipe_modules/build_util/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'fuchsia/goma',
diff --git a/recipe_modules/build_util/examples/full.py b/recipe_modules/build_util/examples/full.py
index f9a4384..869614c 100644
--- a/recipe_modules/build_util/examples/full.py
+++ b/recipe_modules/build_util/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/build_util',
     'fuchsia/goma',
diff --git a/recipe_modules/devicelab_osx_sdk/__init__.py b/recipe_modules/devicelab_osx_sdk/__init__.py
index 4a4af7f..79d9ba1 100644
--- a/recipe_modules/devicelab_osx_sdk/__init__.py
+++ b/recipe_modules/devicelab_osx_sdk/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/cipd',
     'recipe_engine/context',
diff --git a/recipe_modules/devicelab_osx_sdk/examples/full.py b/recipe_modules/devicelab_osx_sdk/examples/full.py
index af97106..f0b7f99 100644
--- a/recipe_modules/devicelab_osx_sdk/examples/full.py
+++ b/recipe_modules/devicelab_osx_sdk/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
   'flutter/devicelab_osx_sdk',
   'recipe_engine/platform',
diff --git a/recipe_modules/display_util/__init__.py b/recipe_modules/display_util/__init__.py
index f39ada2..7e9217e 100644
--- a/recipe_modules/display_util/__init__.py
+++ b/recipe_modules/display_util/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     "recipe_engine/buildbucket",
     "recipe_engine/step",
diff --git a/recipe_modules/display_util/examples/display_builds.py b/recipe_modules/display_util/examples/display_builds.py
index aa20649..33babb0 100644
--- a/recipe_modules/display_util/examples/display_builds.py
+++ b/recipe_modules/display_util/examples/display_builds.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     "flutter/display_util",
     "fuchsia/status_check",
diff --git a/recipe_modules/display_util/examples/display_tasks.py b/recipe_modules/display_util/examples/display_tasks.py
index c9a6882..5f55f6a 100644
--- a/recipe_modules/display_util/examples/display_tasks.py
+++ b/recipe_modules/display_util/examples/display_tasks.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     "flutter/display_util",
     "fuchsia/status_check",
diff --git a/recipe_modules/firebase/__init__.py b/recipe_modules/firebase/__init__.py
index 7c345ee..2911537 100644
--- a/recipe_modules/firebase/__init__.py
+++ b/recipe_modules/firebase/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/context',
     'recipe_engine/file',
diff --git a/recipe_modules/firebase/examples/full.py b/recipe_modules/firebase/examples/full.py
index 16fd705..78a0493 100644
--- a/recipe_modules/firebase/examples/full.py
+++ b/recipe_modules/firebase/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/firebase',
     'recipe_engine/path',
diff --git a/recipe_modules/flutter_deps/__init__.py b/recipe_modules/flutter_deps/__init__.py
index 763c7d2..a8bb4a7 100644
--- a/recipe_modules/flutter_deps/__init__.py
+++ b/recipe_modules/flutter_deps/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/android_virtual_device',
     'flutter/repo_util',
diff --git a/recipe_modules/flutter_deps/examples/full.py b/recipe_modules/flutter_deps/examples/full.py
index 601fca2..d4786d7 100644
--- a/recipe_modules/flutter_deps/examples/full.py
+++ b/recipe_modules/flutter_deps/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/flutter_deps',
     'flutter/repo_util',
diff --git a/recipe_modules/fuchsia_util/__init__.py b/recipe_modules/fuchsia_util/__init__.py
index 620f0e5..6557963 100644
--- a/recipe_modules/fuchsia_util/__init__.py
+++ b/recipe_modules/fuchsia_util/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/gsutil',
     'flutter/display_util',
diff --git a/recipe_modules/fuchsia_util/examples/full.py b/recipe_modules/fuchsia_util/examples/full.py
index b470974..d05cb62 100644
--- a/recipe_modules/fuchsia_util/examples/full.py
+++ b/recipe_modules/fuchsia_util/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/fuchsia_util',
     'flutter/repo_util',
diff --git a/recipe_modules/job/__init__.py b/recipe_modules/job/__init__.py
index 0045121..e953755 100644
--- a/recipe_modules/job/__init__.py
+++ b/recipe_modules/job/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     "recipe_engine/buildbucket",
     "recipe_engine/file",
diff --git a/recipe_modules/job/examples/full.py b/recipe_modules/job/examples/full.py
index 0dfad2a..33a21ae 100644
--- a/recipe_modules/job/examples/full.py
+++ b/recipe_modules/job/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     "flutter/job",
     "recipe_engine/properties",
diff --git a/recipe_modules/kms/__init__.py b/recipe_modules/kms/__init__.py
index 9c46980..43ebde1 100644
--- a/recipe_modules/kms/__init__.py
+++ b/recipe_modules/kms/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/gsutil',
     'recipe_engine/cipd',
diff --git a/recipe_modules/kms/examples/full.py b/recipe_modules/kms/examples/full.py
index 45562ea..b24f366 100644
--- a/recipe_modules/kms/examples/full.py
+++ b/recipe_modules/kms/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import (Filter)
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/kms',
     'recipe_engine/path',
diff --git a/recipe_modules/logs_util/__init__.py b/recipe_modules/logs_util/__init__.py
index 1509627..87d5767 100644
--- a/recipe_modules/logs_util/__init__.py
+++ b/recipe_modules/logs_util/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/gsutil',
     'recipe_engine/buildbucket',
diff --git a/recipe_modules/logs_util/examples/full.py b/recipe_modules/logs_util/examples/full.py
index 6544740..573e2c6 100644
--- a/recipe_modules/logs_util/examples/full.py
+++ b/recipe_modules/logs_util/examples/full.py
@@ -5,8 +5,6 @@
 from PB.recipe_modules.recipe_engine.swarming import properties
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/logs_util',
 ]
diff --git a/recipe_modules/os_utils/__init__.py b/recipe_modules/os_utils/__init__.py
index 5adc711..1df74ac 100644
--- a/recipe_modules/os_utils/__init__.py
+++ b/recipe_modules/os_utils/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'recipe_engine/context',
diff --git a/recipe_modules/os_utils/examples/full.py b/recipe_modules/os_utils/examples/full.py
index 5bbca64..f658031 100644
--- a/recipe_modules/os_utils/examples/full.py
+++ b/recipe_modules/os_utils/examples/full.py
@@ -5,8 +5,6 @@
 from PB.recipe_modules.recipe_engine.swarming import properties
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/os_utils',
     'recipe_engine/platform',
diff --git a/recipe_modules/osx_sdk/__init__.py b/recipe_modules/osx_sdk/__init__.py
index 27d77bd..f0bf2f3 100644
--- a/recipe_modules/osx_sdk/__init__.py
+++ b/recipe_modules/osx_sdk/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/os_utils',
     'recipe_engine/cipd',
diff --git a/recipe_modules/osx_sdk/examples/full.py b/recipe_modules/osx_sdk/examples/full.py
index 975a9a9..31b7799 100644
--- a/recipe_modules/osx_sdk/examples/full.py
+++ b/recipe_modules/osx_sdk/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
   'flutter/os_utils',
   'flutter/osx_sdk',
diff --git a/recipe_modules/repo_util/__init__.py b/recipe_modules/repo_util/__init__.py
index 08ed9f9..72fb2c0 100644
--- a/recipe_modules/repo_util/__init__.py
+++ b/recipe_modules/repo_util/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/bot_update',
     'depot_tools/depot_tools',
diff --git a/recipe_modules/repo_util/examples/full.expected/monorepo_wrong_host.json b/recipe_modules/repo_util/examples/full.expected/monorepo_wrong_host.json
index 76543d0..c02a688 100644
--- a/recipe_modules/repo_util/examples/full.expected/monorepo_wrong_host.json
+++ b/recipe_modules/repo_util/examples/full.expected/monorepo_wrong_host.json
@@ -1003,7 +1003,7 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/full.py\", line 32, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/full.py\", line 30, in RunSteps",
       "    api.repo_util.monorepo_checkout(api.path['start_dir'], {}, {})",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 125, in monorepo_checkout",
       "    raise ValueError(",
diff --git a/recipe_modules/repo_util/examples/full.py b/recipe_modules/repo_util/examples/full.py
index f998c30..4ab0af5 100644
--- a/recipe_modules/repo_util/examples/full.py
+++ b/recipe_modules/repo_util/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'recipe_engine/buildbucket',
diff --git a/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json b/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json
index c487821..6bae8d8 100644
--- a/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json
+++ b/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json
@@ -7,7 +7,7 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/unsupported.py\", line 15, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/unsupported.py\", line 13, in RunSteps",
       "    api.repo_util.checkout('unsupported_repo', repo_dir)",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 200, in checkout",
       "    raise ValueError('Unsupported repo: %s' % name)",
diff --git a/recipe_modules/repo_util/examples/unsupported.py b/recipe_modules/repo_util/examples/unsupported.py
index bbbdb05..8bb58e3 100644
--- a/recipe_modules/repo_util/examples/unsupported.py
+++ b/recipe_modules/repo_util/examples/unsupported.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'recipe_engine/path',
diff --git a/recipe_modules/retry/__init__.py b/recipe_modules/retry/__init__.py
index ac469cc..83eac7e 100644
--- a/recipe_modules/retry/__init__.py
+++ b/recipe_modules/retry/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/test_utils',
     "recipe_engine/step",
diff --git a/recipe_modules/retry/examples/full.py b/recipe_modules/retry/examples/full.py
index e0aff6f..589569e 100644
--- a/recipe_modules/retry/examples/full.py
+++ b/recipe_modules/retry/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/retry',
     'recipe_engine/properties',
diff --git a/recipe_modules/sdk/__init__.py b/recipe_modules/sdk/__init__.py
index 3eaa595..3addc15 100644
--- a/recipe_modules/sdk/__init__.py
+++ b/recipe_modules/sdk/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'fuchsia/gsutil',
     'fuchsia/tar',
diff --git a/recipe_modules/sdk/examples/full.py b/recipe_modules/sdk/examples/full.py
index 09928c8..63cd172 100644
--- a/recipe_modules/sdk/examples/full.py
+++ b/recipe_modules/sdk/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/sdk',
     'fuchsia/status_check',
diff --git a/recipe_modules/shard_util/__init__.py b/recipe_modules/shard_util/__init__.py
index ed74a4c..28fa90e 100644
--- a/recipe_modules/shard_util/__init__.py
+++ b/recipe_modules/shard_util/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/buildbucket',
     'recipe_engine/platform',
diff --git a/recipe_modules/shard_util/examples/full.py b/recipe_modules/shard_util/examples/full.py
index ff9a119..1fb1f92 100644
--- a/recipe_modules/shard_util/examples/full.py
+++ b/recipe_modules/shard_util/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/shard_util',
     'recipe_engine/platform',
diff --git a/recipe_modules/shard_util_v2/__init__.py b/recipe_modules/shard_util_v2/__init__.py
index 7cf75f7..1218035 100644
--- a/recipe_modules/shard_util_v2/__init__.py
+++ b/recipe_modules/shard_util_v2/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'fuchsia/cas_util',
     'recipe_engine/buildbucket',
diff --git a/recipe_modules/shard_util_v2/examples/full.py b/recipe_modules/shard_util_v2/examples/full.py
index 195f323..10104c3 100644
--- a/recipe_modules/shard_util_v2/examples/full.py
+++ b/recipe_modules/shard_util_v2/examples/full.py
@@ -6,8 +6,6 @@
 
 from PB.go.chromium.org.luci.buildbucket.proto import common as common_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/shard_util_v2',
     'fuchsia/buildbucket_util',
diff --git a/recipe_modules/ssh/__init__.py b/recipe_modules/ssh/__init__.py
index a524c35..d2063c3 100644
--- a/recipe_modules/ssh/__init__.py
+++ b/recipe_modules/ssh/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/buildbucket',
     'recipe_engine/file',
diff --git a/recipe_modules/ssh/examples/full.py b/recipe_modules/ssh/examples/full.py
index 696419d..2674f4b 100644
--- a/recipe_modules/ssh/examples/full.py
+++ b/recipe_modules/ssh/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/ssh',
     'fuchsia/status_check',
diff --git a/recipe_modules/test_utils/__init__.py b/recipe_modules/test_utils/__init__.py
index 6347824..fb75663 100644
--- a/recipe_modules/test_utils/__init__.py
+++ b/recipe_modules/test_utils/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/context',
     'recipe_engine/platform',
diff --git a/recipe_modules/test_utils/examples/full.py b/recipe_modules/test_utils/examples/full.py
index 7369914..9ea30ba 100644
--- a/recipe_modules/test_utils/examples/full.py
+++ b/recipe_modules/test_utils/examples/full.py
@@ -5,8 +5,6 @@
 from PB.recipe_modules.recipe_engine.swarming import properties
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/test_utils',
     'recipe_engine/platform',
diff --git a/recipe_modules/token_util/__init__.py b/recipe_modules/token_util/__init__.py
index a6f1ccc..6eff045 100644
--- a/recipe_modules/token_util/__init__.py
+++ b/recipe_modules/token_util/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/file',
     'recipe_engine/path',
diff --git a/recipe_modules/token_util/examples/full.py b/recipe_modules/token_util/examples/full.py
index aaae294..53afcbe 100644
--- a/recipe_modules/token_util/examples/full.py
+++ b/recipe_modules/token_util/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/token_util',
 ]
diff --git a/recipe_modules/vdl/__init__.py b/recipe_modules/vdl/__init__.py
index dddab77..d9c8e2b 100644
--- a/recipe_modules/vdl/__init__.py
+++ b/recipe_modules/vdl/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/sdk',
     'flutter/ssh',
diff --git a/recipe_modules/vdl/examples/full.py b/recipe_modules/vdl/examples/full.py
index 4188827..45fa50f 100644
--- a/recipe_modules/vdl/examples/full.py
+++ b/recipe_modules/vdl/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/vdl',
     'fuchsia/status_check',
diff --git a/recipe_modules/web_util/__init__.py b/recipe_modules/web_util/__init__.py
index a582832..39ee669 100644
--- a/recipe_modules/web_util/__init__.py
+++ b/recipe_modules/web_util/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/git',
     'depot_tools/gsutil',
diff --git a/recipe_modules/web_util/examples/full.expected/fail case.json b/recipe_modules/web_util/examples/full.expected/fail case.json
index 03ebc81..a348b6e 100644
--- a/recipe_modules/web_util/examples/full.expected/fail case.json
+++ b/recipe_modules/web_util/examples/full.expected/fail case.json
@@ -7,7 +7,7 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/examples/full.py\", line 21, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/examples/full.py\", line 19, in RunSteps",
       "    api.web_util.prepare_web_dependencies(engine_checkout_path)",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/api.py\", line 86, in prepare_web_dependencies",
       "    raise ValueError('Web Dependency %s not available.' % dep)",
diff --git a/recipe_modules/web_util/examples/full.py b/recipe_modules/web_util/examples/full.py
index 26b9408..3669ca8 100644
--- a/recipe_modules/web_util/examples/full.py
+++ b/recipe_modules/web_util/examples/full.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/web_util',
     'recipe_engine/json',
diff --git a/recipe_modules/yaml/__init__.py b/recipe_modules/yaml/__init__.py
index 57fca6c..7fae6f1 100644
--- a/recipe_modules/yaml/__init__.py
+++ b/recipe_modules/yaml/__init__.py
@@ -1,5 +1,3 @@
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/file',
     'recipe_engine/json',
diff --git a/recipe_modules/yaml/examples/full.py b/recipe_modules/yaml/examples/full.py
index b9142cf..5f44774 100644
--- a/recipe_modules/yaml/examples/full.py
+++ b/recipe_modules/yaml/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/yaml',
     'recipe_engine/assertions',
diff --git a/recipe_modules/zip/__init__.py b/recipe_modules/zip/__init__.py
index a5e83f3..61dd06f 100644
--- a/recipe_modules/zip/__init__.py
+++ b/recipe_modules/zip/__init__.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
   'recipe_engine/json',
   'recipe_engine/path',
diff --git a/recipe_modules/zip/examples/full.py b/recipe_modules/zip/examples/full.py
index 564b426..5e99730 100644
--- a/recipe_modules/zip/examples/full.py
+++ b/recipe_modules/zip/examples/full.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
   'flutter/zip',
   'recipe_engine/context',
diff --git a/recipes/cipd/cosign.py b/recipes/cipd/cosign.py
index 8ef69bd..dce0c3d 100644
--- a/recipes/cipd/cosign.py
+++ b/recipes/cipd/cosign.py
@@ -5,8 +5,6 @@
 import json
 from datetime import datetime
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'flutter/flutter_deps',
diff --git a/recipes/cocoon/cipd.py b/recipes/cocoon/cipd.py
index 1a55e79..7a25be5 100644
--- a/recipes/cocoon/cipd.py
+++ b/recipes/cocoon/cipd.py
@@ -5,8 +5,6 @@
 from platform import platform
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'flutter/yaml',
diff --git a/recipes/cocoon/cocoon.py b/recipes/cocoon/cocoon.py
index 90b2a79..b6968e0 100644
--- a/recipes/cocoon/cocoon.py
+++ b/recipes/cocoon/cocoon.py
@@ -4,8 +4,6 @@
 
 """Recipe for cocoon repository tests."""
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'flutter/yaml',
diff --git a/recipes/cocoon/device_doctor.py b/recipes/cocoon/device_doctor.py
index 9419047..66588db 100644
--- a/recipes/cocoon/device_doctor.py
+++ b/recipes/cocoon/device_doctor.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'recipe_engine/cipd',
diff --git a/recipes/devicelab/devicelab_drone.expected/no-task-name.json b/recipes/devicelab/devicelab_drone.expected/no-task-name.json
index 1b63109..4a7aeea 100644
--- a/recipes/devicelab/devicelab_drone.expected/no-task-name.json
+++ b/recipes/devicelab/devicelab_drone.expected/no-task-name.json
@@ -19,7 +19,7 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipes/devicelab/devicelab_drone.py\", line 43, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipes/devicelab/devicelab_drone.py\", line 40, in RunSteps",
       "    raise ValueError('A task_name property is required')",
       "ValueError('A task_name property is required')"
     ]
diff --git a/recipes/devicelab/devicelab_drone.py b/recipes/devicelab/devicelab_drone.py
index 56e05bf..ee4523c 100644
--- a/recipes/devicelab/devicelab_drone.py
+++ b/recipes/devicelab/devicelab_drone.py
@@ -4,9 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/devicelab_osx_sdk',
     'flutter/flutter_deps',
diff --git a/recipes/engine/engine.py b/recipes/engine/engine.py
index e59ff19..53951d4 100644
--- a/recipes/engine/engine.py
+++ b/recipes/engine/engine.py
@@ -10,8 +10,6 @@
 from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
 from google.protobuf import struct_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine/engine_arm.py b/recipes/engine/engine_arm.py
index fcc30a7..866b479 100644
--- a/recipes/engine/engine_arm.py
+++ b/recipes/engine/engine_arm.py
@@ -10,8 +10,6 @@
 from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
 from google.protobuf import struct_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine/engine_builder.py b/recipes/engine/engine_builder.py
index 07c9ee3..36c6ddc 100644
--- a/recipes/engine/engine_builder.py
+++ b/recipes/engine/engine_builder.py
@@ -7,8 +7,6 @@
 
 from PB.recipes.flutter.engine.engine_builder import InputProperties, EngineBuild
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
   'depot_tools/depot_tools',
   'flutter/os_utils',
diff --git a/recipes/engine/engine_license.py b/recipes/engine/engine_license.py
index 381dd64..02eff8d 100644
--- a/recipes/engine/engine_license.py
+++ b/recipes/engine/engine_license.py
@@ -7,8 +7,6 @@
 from PB.recipes.flutter.engine.engine_license import InputProperties
 from PB.recipes.flutter.engine.engine_license import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine/engine_lint.py b/recipes/engine/engine_lint.py
index 5ef170c..425d75c 100644
--- a/recipes/engine/engine_lint.py
+++ b/recipes/engine/engine_lint.py
@@ -7,8 +7,6 @@
 from PB.recipes.flutter.engine.engine_lint import InputProperties
 from PB.recipes.flutter.engine.engine_lint import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine/engine_metrics.py b/recipes/engine/engine_metrics.py
index 9467b14..96ffced 100644
--- a/recipes/engine/engine_metrics.py
+++ b/recipes/engine/engine_metrics.py
@@ -5,8 +5,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'flutter/build_util',
diff --git a/recipes/engine/engine_unopt.py b/recipes/engine/engine_unopt.py
index 14f3e1a..9d139b7 100644
--- a/recipes/engine/engine_unopt.py
+++ b/recipes/engine/engine_unopt.py
@@ -7,8 +7,6 @@
 from PB.recipes.flutter.engine.engine_unopt import InputProperties
 from PB.recipes.flutter.engine.engine_unopt import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine/femu_test.py b/recipes/engine/femu_test.py
index 9d7963c..fe38962 100644
--- a/recipes/engine/femu_test.py
+++ b/recipes/engine/femu_test.py
@@ -12,8 +12,6 @@
 
 import re
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'flutter/repo_util',
diff --git a/recipes/engine/framework_smoke.py b/recipes/engine/framework_smoke.py
index 048cb04..1954cf0 100644
--- a/recipes/engine/framework_smoke.py
+++ b/recipes/engine/framework_smoke.py
@@ -12,8 +12,6 @@
 from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
 from google.protobuf import struct_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/build_util',
     'flutter/repo_util',
diff --git a/recipes/engine/scenarios.py b/recipes/engine/scenarios.py
index f878cdc..72a93c8 100644
--- a/recipes/engine/scenarios.py
+++ b/recipes/engine/scenarios.py
@@ -7,8 +7,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'flutter/android_virtual_device',
diff --git a/recipes/engine/web_engine.py b/recipes/engine/web_engine.py
index 7fa47d0..dc1edf3 100644
--- a/recipes/engine/web_engine.py
+++ b/recipes/engine/web_engine.py
@@ -12,8 +12,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine/web_engine_drone.expected/linux-error.json b/recipes/engine/web_engine_drone.expected/linux-error.json
index 5d682ed..a0c203d 100644
--- a/recipes/engine/web_engine_drone.expected/linux-error.json
+++ b/recipes/engine/web_engine_drone.expected/linux-error.json
@@ -261,7 +261,7 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipes/engine/web_engine_drone.py\", line 82, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipes/engine/web_engine_drone.py\", line 80, in RunSteps",
       "    api.web_util.prepare_web_dependencies(checkout)",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/api.py\", line 86, in prepare_web_dependencies",
       "    raise ValueError('Web Dependency %s not available.' % dep)",
diff --git a/recipes/engine/web_engine_drone.py b/recipes/engine/web_engine_drone.py
index dcdb764..3b74cce 100644
--- a/recipes/engine/web_engine_drone.py
+++ b/recipes/engine/web_engine_drone.py
@@ -19,8 +19,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'flutter/flutter_deps',
diff --git a/recipes/engine/web_engine_framework.py b/recipes/engine/web_engine_framework.py
index 973ba0a..bba9018 100644
--- a/recipes/engine/web_engine_framework.py
+++ b/recipes/engine/web_engine_framework.py
@@ -12,8 +12,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/gclient',
diff --git a/recipes/engine_v2/builder.py b/recipes/engine_v2/builder.py
index 1bd5bfd..01128cf 100644
--- a/recipes/engine_v2/builder.py
+++ b/recipes/engine_v2/builder.py
@@ -34,8 +34,6 @@
 from PB.recipes.flutter.engine.engine import EnvProperties
 from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/gsutil',
     'flutter/build_util',
diff --git a/recipes/engine_v2/engine_v2.py b/recipes/engine_v2/engine_v2.py
index df38902..63fa534 100644
--- a/recipes/engine_v2/engine_v2.py
+++ b/recipes/engine_v2/engine_v2.py
@@ -22,8 +22,6 @@
   import builds_service as builds_service_pb2
 from google.protobuf import struct_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/gsutil',
     'flutter/display_util',
diff --git a/recipes/engine_v2/tester.py b/recipes/engine_v2/tester.py
index 62d5893..f5501c3 100644
--- a/recipes/engine_v2/tester.py
+++ b/recipes/engine_v2/tester.py
@@ -14,8 +14,6 @@
 from PB.recipes.flutter.engine.engine import EnvProperties
 from PB.go.chromium.org.luci.buildbucket.proto import build as build_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/properties',
 ]
diff --git a/recipes/firebaselab/firebaselab.py b/recipes/firebaselab/firebaselab.py
index 39875cf..7928ee2 100644
--- a/recipes/firebaselab/firebaselab.py
+++ b/recipes/firebaselab/firebaselab.py
@@ -9,8 +9,6 @@
 from contextlib import contextmanager
 import re
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/flutter_deps',
     'flutter/repo_util',
diff --git a/recipes/flutter/android_views.py b/recipes/flutter/android_views.py
index ad5baa8..0a78cf8 100644
--- a/recipes/flutter/android_views.py
+++ b/recipes/flutter/android_views.py
@@ -12,8 +12,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/android_virtual_device',
     'flutter/flutter_deps',
diff --git a/recipes/flutter/deferred_components.py b/recipes/flutter/deferred_components.py
index 4bb0f82..4d8725d 100644
--- a/recipes/flutter/deferred_components.py
+++ b/recipes/flutter/deferred_components.py
@@ -12,8 +12,6 @@
 from PB.recipes.flutter.engine.engine import InputProperties
 from PB.recipes.flutter.engine.engine import EnvProperties
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/android_virtual_device',
     'flutter/flutter_deps',
diff --git a/recipes/flutter/flutter.py b/recipes/flutter/flutter.py
index be6ea27..cd931e5 100644
--- a/recipes/flutter/flutter.py
+++ b/recipes/flutter/flutter.py
@@ -11,8 +11,6 @@
   import builds_service as builds_service_pb2
 from google.protobuf import struct_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/adhoc_validation',
     'flutter/display_util',
@@ -81,4 +79,4 @@
           android_sdk_license='android_license',
           android_sdk_preview_license='android_preview_license'
       ), api.repo_util.flutter_environment_data()
-  )
\ No newline at end of file
+  )
diff --git a/recipes/flutter/flutter_drone.py b/recipes/flutter/flutter_drone.py
index 7cb231c..8505c5e 100644
--- a/recipes/flutter/flutter_drone.py
+++ b/recipes/flutter/flutter_drone.py
@@ -8,8 +8,6 @@
 from contextlib import contextmanager
 import re
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/flutter_deps',
     'flutter/os_utils',
diff --git a/recipes/fuchsia/fuchsia.py b/recipes/fuchsia/fuchsia.py
index a9a25b4..6cd85ad 100644
--- a/recipes/fuchsia/fuchsia.py
+++ b/recipes/fuchsia/fuchsia.py
@@ -6,8 +6,6 @@
 from contextlib import contextmanager
 import re
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/fuchsia_util',
     'flutter/repo_util',
diff --git a/recipes/fuchsia_ctl.py b/recipes/fuchsia_ctl.py
index 0d9eb46..2fc831a 100644
--- a/recipes/fuchsia_ctl.py
+++ b/recipes/fuchsia_ctl.py
@@ -4,8 +4,6 @@
 
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/display_util',
     'flutter/repo_util',
diff --git a/recipes/infra/ci_yaml.py b/recipes/infra/ci_yaml.py
index 135b493..15de5ef 100644
--- a/recipes/infra/ci_yaml.py
+++ b/recipes/infra/ci_yaml.py
@@ -6,8 +6,6 @@
 
 from PB.go.chromium.org.luci.common.proto.gerrit import gerrit as gerrit_pb2
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'fuchsia/auto_roller',
diff --git a/recipes/infra/luci_config.py b/recipes/infra/luci_config.py
index 510f0bd..490ded5 100644
--- a/recipes/infra/luci_config.py
+++ b/recipes/infra/luci_config.py
@@ -4,8 +4,6 @@
 
 """Recipe for testing LUCI configs."""
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'fuchsia/git',
     'fuchsia/git_checkout',
diff --git a/recipes/infra/test_ownership.py b/recipes/infra/test_ownership.py
index fc771a1..b57cb44 100644
--- a/recipes/infra/test_ownership.py
+++ b/recipes/infra/test_ownership.py
@@ -11,8 +11,6 @@
 # The pre-submit `sha` and `repo` are needed for validation. Violated builders will
 # be returned in stdout when ownership is missing.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/repo_util',
     'recipe_engine/context',
diff --git a/recipes/ios_usb_dependencies/ios-usb-dependencies.py b/recipes/ios_usb_dependencies/ios-usb-dependencies.py
index 178f8b2..848f01c 100644
--- a/recipes/ios_usb_dependencies/ios-usb-dependencies.py
+++ b/recipes/ios_usb_dependencies/ios-usb-dependencies.py
@@ -4,8 +4,6 @@
 
 from contextlib import contextmanager
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/gsutil',
     'flutter/devicelab_osx_sdk',
diff --git a/recipes/packages/packages.py b/recipes/packages/packages.py
index cb27878..25af4d7 100644
--- a/recipes/packages/packages.py
+++ b/recipes/packages/packages.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/flutter_deps',
     'flutter/repo_util',
diff --git a/recipes/packaging/packaging.py b/recipes/packaging/packaging.py
index d5524ca..235d55e 100644
--- a/recipes/packaging/packaging.py
+++ b/recipes/packaging/packaging.py
@@ -5,8 +5,6 @@
 from contextlib import contextmanager
 import re
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'depot_tools/depot_tools',
     'depot_tools/git',
diff --git a/recipes/plugins/plugins.py b/recipes/plugins/plugins.py
index 32eb665..e1a90e4 100644
--- a/recipes/plugins/plugins.py
+++ b/recipes/plugins/plugins.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'flutter/flutter_deps',
     'flutter/repo_util',
diff --git a/recipes/plugins/plugins_publish.py b/recipes/plugins/plugins_publish.py
index e98a5c6..d5aea15 100644
--- a/recipes/plugins/plugins_publish.py
+++ b/recipes/plugins/plugins_publish.py
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'recipe_engine/step',
 ]
diff --git a/recipes/recipes.py b/recipes/recipes.py
index db1720f..2938ef8 100644
--- a/recipes/recipes.py
+++ b/recipes/recipes.py
@@ -11,8 +11,6 @@
 from PB.recipe_modules.fuchsia.recipe_testing import options as options_pb2
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     'fuchsia/commit_queue',
     'fuchsia/git',
diff --git a/recipes/tricium/tricium.py b/recipes/tricium/tricium.py
index 7103880..6b5fffc 100644
--- a/recipes/tricium/tricium.py
+++ b/recipes/tricium/tricium.py
@@ -9,8 +9,6 @@
 from recipe_engine.config import ConfigList, ConfigGroup, Single
 from recipe_engine.recipe_api import Property
 
-PYTHON_VERSION_COMPATIBILITY = 'PY3'
-
 DEPS = [
     "fuchsia/git",
     "fuchsia/tricium_analyze",