[infra] Change all Python shebangs to Python3

The infrastructure runs everything already in Python3, so this is
mostly a clean-up.

For MB, a python2 holdover was removed and new lint errors were
fixed.

The renames were automated with:
git grep -e "/usr/bin/python$" |
  cut -d':' -f1 |
  xargs
  sed -i 's/#!\/usr\/bin\/python$/#!\/usr\/bin\/python3/1'

and
git grep -e "/usr/bin/env python$" |
  cut -d':' -f1 |
  xargs
  sed -i 's/#!\/usr\/bin\/env python$/#!\/usr\/bin\/env python3/1'

Bug: v8:13148
Change-Id: If4f3c7635e72fa134798d55314ac1aa92ddd01bf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3811499Reviewed-by: Liviu Rau <liviurau@google.com>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82231}

gni/protoc.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2021 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

test/benchmarks/csuite/benchmark.py

-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright 2018 the V8 project authors. All rights reserved.
 
 '''

test/benchmarks/csuite/compare-baseline.py

-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright 2018 the V8 project authors. All rights reserved.
 
 '''

test/benchmarks/csuite/csuite.py

-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright 2018 the V8 project authors. All rights reserved.
 '''
 C S u i t e                                         because who can remember?

third_party/test262-harness/src/_monkeyYaml.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2014 by Sam Mikes.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.
 

third_party/test262-harness/src/parseTestRecord.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2011 by Google, Inc.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.

third_party/test262-harness/src/test262.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2009 the Sputnik authors.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.
 

third_party/test262-harness/test/test_common.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2014 by Sam Mikes.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.

third_party/test262-harness/test/test_monkeyYaml.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2014 by Sam Mikes.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.

third_party/test262-harness/test/test_parseTestRecord.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2014 by Sam Mikes.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.

third_party/test262-harness/test/test_test262.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2014 by Sam Mikes.  All rights reserved.
 # This code is governed by the BSD license found in the LICENSE file.

tools/__init__.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/adb-d8.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/android-run.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/avg.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can

tools/bigint-tester.py

-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/builtins-pgo/combine_hints.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2022 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can

tools/builtins-pgo/generate.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2022 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can

tools/builtins-pgo/get_hints.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2022 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can

tools/callstats.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/clusterfuzz/js_fuzzer/tools/fuzz_one.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2020 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/clusterfuzz/js_fuzzer/tools/minimize.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2020 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/clusterfuzz/js_fuzzer/tools/run_one.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2020 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/clusterfuzz/js_fuzzer/tools/workbench.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2020 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/dev/gen-tags.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/dev/v8gen.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/disasm.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/dump-cpp.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/eval_gc_nvp.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/find-commit-for-patch.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/gc-nvp-to-csv.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/gc-nvp-trace-processor.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2010 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/gen-inlining-tests.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/gen-keywords-gen-h.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/gen-postmortem-metadata.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Copyright 2012 the V8 project authors. All rights reserved.

tools/gen-v8-gn.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2021 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/generate-builtins-tests.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/generate-header-include-checks.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # vim:fenc=utf-8:shiftwidth=2
 
 # Copyright 2018 the V8 project authors. All rights reserved.

tools/generate_shim_headers/generate_shim_headers.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/locs.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/mb/PRESUBMIT.py

@@ -18,15 +18,17 @@ def _CommonChecks(input_api, output_api):
   # Run the MB unittests.
   results.extend(
       input_api.canned_checks.RunUnitTestsInDirectory(input_api, output_api,
-                                                      '.', [r'^.+_test\.py$']))
+                                                      '.', [r'^.+_test\.py$'],
+                                                      run_on_python2=False))
 
   # Validate the format of the mb_config.pyl file.
-  cmd = [input_api.python_executable, 'mb.py', 'validate']
+  cmd = [input_api.python3_executable, 'mb.py', 'validate']
   kwargs = {'cwd': input_api.PresubmitLocalPath()}
   results.extend(input_api.RunTests([
       input_api.Command(name='mb_validate',
                         cmd=cmd, kwargs=kwargs,
-                        message=output_api.PresubmitError)]))
+                        message=output_api.PresubmitError,
+                        python3=True)]))
 
   is_mb_config = (lambda filepath: 'mb_config.pyl' in filepath.LocalPath())
   results.extend(

tools/mb/mb.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -66,9 +66,9 @@ def _v8_builder_fallback(builder, builder_group):
   elif builder.endswith(' builder'):
     builders.append(builder[:-len(' builder')])
 
-  for builder in builders:
-    if builder in builder_group:
-      return builder_group[builder]
+  for b in builders:
+    if b in builder_group:
+      return builder_group[b]
   return None
 
 
@@ -77,7 +77,7 @@ def main(args):
   return mbw.Main(args)
 
 
-class MetaBuildWrapper(object):
+class MetaBuildWrapper():
   def __init__(self):
     self.chromium_src_dir = CHROMIUM_SRC_DIR
     self.default_config = os.path.join(self.chromium_src_dir, 'infra', 'mb',
@@ -562,7 +562,7 @@ class MetaBuildWrapper(object):
       contents = ast.literal_eval(self.ReadFile(self.args.config_file))
     except SyntaxError as e:
       raise MBErr('Failed to parse config file "%s": %s' %
-                 (self.args.config_file, e))
+                 (self.args.config_file, e)) from e
 
     self.configs = contents['configs']
     self.luci_tryservers = contents.get('luci_tryservers', {})
@@ -587,8 +587,8 @@ class MetaBuildWrapper(object):
               ', '.join(duplicates))
         isolate_maps.update(isolate_map)
       except SyntaxError as e:
-        raise MBErr(
-            'Failed to parse isolate map file "%s": %s' % (isolate_map, e))
+        raise MBErr('Failed to parse isolate map file "%s": %s' %
+                    (isolate_map, e)) from e
     return isolate_maps
 
   def ConfigFromArgs(self):
@@ -1071,7 +1071,7 @@ class MetaBuildWrapper(object):
                      force_verbose=force_verbose)
     except Exception as e:
       raise MBErr('Error %s writing to the output path "%s"' %
-                 (e, path))
+                 (e, path)) from e
 
   def CheckCompile(self, builder_group, builder):
     url_template = self.args.url_template + '/{builder}/builds/_all?as_text=1'
@@ -1089,7 +1089,7 @@ class MetaBuildWrapper(object):
     if not successes:
       return "no successful builds"
     build = builds[str(successes[0])]
-    step_names = set([step["name"] for step in build["steps"]])
+    step_names = {step["name"] for step in build["steps"]}
     compile_indicators = set(["compile", "compile (with patch)", "analyze"])
     if compile_indicators & step_names:
       return "compiles"

tools/mb/mb_test.py

-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -6,7 +6,7 @@
 """Tests for mb.py."""
 
 import json
-import StringIO
+import io
 import os
 import sys
 import unittest
@@ -17,7 +17,7 @@ import mb
 class FakeMBW(mb.MetaBuildWrapper):
 
   def __init__(self, win32=False):
-    super(FakeMBW, self).__init__()
+    super().__init__()
 
     # Override vars for test portability.
     if win32:
@@ -85,14 +85,14 @@ class FakeMBW(mb.MetaBuildWrapper):
   def RemoveFile(self, path):
     del self.files[path]
 
-  def RemoveDirectory(self, path):
-    self.rmdirs.append(path)
-    files_to_delete = [f for f in self.files if f.startswith(path)]
+  def RemoveDirectory(self, abs_path):
+    self.rmdirs.append(abs_path)
+    files_to_delete = [f for f in self.files if f.startswith(abs_path)]
     for f in files_to_delete:
       self.files[f] = None
 
 
-class FakeFile(object):
+class FakeFile():
 
   def __init__(self, files):
     self.name = '/tmp/file'
@@ -592,7 +592,7 @@ class UnitTest(unittest.TestCase):
   def test_help(self):
     orig_stdout = sys.stdout
     try:
-      sys.stdout = StringIO.StringIO()
+      sys.stdout = io.StringIO()
       self.assertRaises(SystemExit, self.check, ['-h'])
       self.assertRaises(SystemExit, self.check, ['help'])
       self.assertRaises(SystemExit, self.check, ['help', 'gen'])

tools/objdump-v8

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/perf-compare.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/profiling/ll_prof.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/regexp-sequences.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2019 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/release/auto_roll.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/release/filter_build_files.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/release/mergeinfo.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/release/test_mergeinfo.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/run-clang-tidy.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/run-num-fuzzer.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/run-tests.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/run-wasm-api-tests.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2019 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/sanitizers/sancov_formatter.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/sanitizers/sancov_merger.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/sanitizers/sanitize_pcs.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/snapshot/asm_to_inline_asm.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/stats-viewer.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without

tools/testrunner/local/fake_testsuite/testcfg.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2019 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/try_perf.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/unittests/testdata/d8_mocked1.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/unittests/testdata/d8_mocked2.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/unittests/testdata/results_processor.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/v8windbg/copy-prereqs.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2020 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/wasm-compilation-hints/inject-compilation-hints.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be found

tools/wasm-compilation-hints/wasm-objdump-compilation-hints.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be found

tools/wasm-compilation-hints/wasm.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be found