Migrate all Python scripts to Python 3

This migrates all checked in Python scripts to run under Python 3.x.
Python 2.7 reached end-of-life in January of 2020 and has been removed
from may OS distributions at this point.

Rolls buildroot to 607277f

Issue: flutter/flutter#83043

DEPS

@@ -98,7 +98,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '3ae5da28db8cb028e21150f7472d0938fba2e057',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '607277f54052acd038edb4fe4c2f57fd81d96baf',
 
    # Fuchsia compatibility
    #

build/copy_info_plist.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -13,9 +13,6 @@
 usage: copy_info_plist.py <src_path> <dest_path> --bitcode=<enable_bitcode>
 """
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
 import subprocess
 
 import sys

build/dart/tools/dart_package_name.py

@@ -1,4 +1,5 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/dart/tools/dart_pkg.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -81,7 +81,7 @@ def copy(from_root, to_root, filter_func=None):
         os.makedirs(to_dir)
       shutil.copy(from_path, to_path)
 
-    dirs[:] = filter(wrapped_filter, dirs)
+    dirs[:] = list(filter(wrapped_filter, dirs))
 
 
 def copy_or_link(from_root, to_root, filter_func=None):
@@ -114,7 +114,7 @@ def list_files(from_root, filter_func=None):
     for name in filter(wrapped_filter, files):
       path = os.path.join(root, name)
       file_list.append(path)
-    dirs[:] = filter(wrapped_filter, dirs)
+    dirs[:] = list(filter(wrapped_filter, dirs))
   return file_list
 
 

build/generate_coverage.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -75,7 +75,7 @@ def main():
 
     RemoveIfExists(raw_profile)
 
-    print "Running test %s to gather profile." % os.path.basename(absolute_test_path)
+    print("Running test %s to gather profile." % os.path.basename(absolute_test_path))
 
     subprocess.check_call([absolute_test_path], env={
       "LLVM_PROFILE_FILE":  raw_profile

build/git_revision.py

@@ -1,13 +1,10 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Get the Git HEAD revision of a specified Git repository."""
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
 
 import sys
 import subprocess

build/zip.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

lib/spirv/test/exception_shaders/assemble.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

shell/platform/fuchsia/flutter/build/asset_package.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

shell/platform/fuchsia/flutter/build/gen_debug_wrapper_main.py

@@ -1,7 +1,9 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
+
 import argparse
 import os
 import re

sky/tools/create_ios_framework.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

sky/tools/create_macos_gen_snapshots.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

sky/tools/create_xcframework.py

@@ -1,12 +1,9 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import errno
 import os

sky/tools/dist_dart_pkg.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

sky/tools/install_framework_headers.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

sky/tools/objcopy.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

sky/tools/roll/patch.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -33,10 +34,10 @@ def patch(dest_dir, relative_patches_dir=os.curdir):
 
   os.chdir(dest_dir)
   for p in utils.find(["*.patch"], patches_dir):
-    print "applying patch %s" % os.path.basename(p)
+    print("applying patch %s" % os.path.basename(p))
     try:
       utils.system(["git", "apply", p])
       utils.commit("applied patch %s" % os.path.basename(p))
     except subprocess.CalledProcessError:
-      print "ERROR: patch %s failed to apply" % os.path.basename(p)
+      print("ERROR: patch %s failed to apply" % os.path.basename(p))
       raise

sky/tools/roll/roll.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -8,7 +9,7 @@
 import os
 import subprocess
 import sys
-import urllib2
+import urllib.request, urllib.error, urllib.parse
 from utils import commit
 from utils import system
 import patch
@@ -96,12 +97,12 @@ def rev(source_dir, dest_dir, dirs_to_rev, name, revision_file=None):
       else:
           d = dir_to_rev
           file_subset = None
-      print "removing directory %s" % d
+      print("removing directory %s" % d)
       try:
           system(["git", "rm", "-r", d], cwd=dest_dir)
       except subprocess.CalledProcessError:
-          print "Could not remove %s" % d
-      print "cloning directory %s" % d
+          print("Could not remove %s" % d)
+      print("cloning directory %s" % d)
 
       if file_subset is None:
           files = system(["git", "ls-files", d], cwd=source_dir).splitlines()
@@ -151,8 +152,8 @@ def main():
       try:
           patch.patch_and_filter(dest_dir, os.path.join('patches', 'chromium'))
       except subprocess.CalledProcessError:
-          print "ERROR: Roll failed due to a patch not applying"
-          print "Fix the patch to apply, commit the result, and re-run this script"
+          print("ERROR: Roll failed due to a patch not applying")
+          print("Fix the patch to apply, commit the result, and re-run this script")
           return 1
 
   return 0

sky/tools/roll/utils.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

testing/run_tests.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -26,17 +27,17 @@
 
 
 def PrintDivider(char='='):
-  print '\n'
-  for _ in xrange(4):
-    print(''.join([char for _ in xrange(80)]))
-  print '\n'
+  print('\n')
+  for _ in range(4):
+    print(''.join([char for _ in range(80)]))
+  print('\n')
 
 
 def RunCmd(cmd, forbidden_output=[], expect_failure=False, **kwargs):
   command_string = ' '.join(cmd)
 
   PrintDivider('>')
-  print 'Running command "%s"' % command_string
+  print('Running command "%s"' % command_string)
 
   start_time = time.time()
   stdout_pipe = sys.stdout if not forbidden_output else subprocess.PIPE
@@ -69,7 +70,7 @@ def RunCmd(cmd, forbidden_output=[], expect_failure=False, **kwargs):
       raise Exception('command "%s" contained forbidden string %s' % (command_string, forbidden_string))
 
   PrintDivider('<')
-  print 'Command run successfully in %.2f seconds: %s' % (end_time - start_time, command_string)
+  print('Command run successfully in %.2f seconds: %s' % (end_time - start_time, command_string))
 
 
 def IsMac():
@@ -394,12 +395,12 @@ def RunJavaTests(filter, android_variant='android_debug_unopt'):
   EnsureJavaTestsAreBuilt(android_out_dir)
 
   embedding_deps_dir = os.path.join(buildroot_dir, 'third_party', 'android_embedding_dependencies', 'lib')
-  classpath = map(str, [
+  classpath = list(map(str, [
     os.path.join(buildroot_dir, 'third_party', 'android_tools', 'sdk', 'platforms', 'android-30', 'android.jar'),
     os.path.join(embedding_deps_dir, '*'), # Wildcard for all jars in the directory
     os.path.join(android_out_dir, 'flutter.jar'),
     os.path.join(android_out_dir, 'robolectric_tests.jar')
-  ])
+  ]))
 
   test_class = filter if filter else 'io.flutter.FlutterTestSuite'
   command = [

tools/android_illegal_imports.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2013 The Flutter 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/androidx/generate_pom_file.py

@@ -1,5 +1,6 @@
-#!/usr/bin/env python
-# Copyright 2019 The Flutter Authors. All rights reserved.
+#!/usr/bin/env python3
+#
+# Copyright 2013 The Flutter 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/dia_dll.py

@@ -1,5 +1,6 @@
-#!/usr/bin/env python
-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+#!/usr/bin/env python3
+#
+# Copyright 2013 The Flutter 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/font-subset/test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/fuchsia/build_fuchsia_artifacts.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/fuchsia/copy_debug_symbols.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -102,7 +102,7 @@ def main():
       raise
 
   if not os.path.exists(dbg_prefix_base):
-    print 'Unable to create directory: %s.' % dbg_prefix_base
+    print('Unable to create directory: %s.' % dbg_prefix_base)
     return 1
 
   dbg_suffix = ''

tools/fuchsia/copy_path.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/fuchsia/gather_flutter_runner_artifacts.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -58,11 +58,11 @@ def GatherArtifacts(src_root, dst_root, create_meta_package=True):
   else:
     shutil.rmtree(dst_root)
 
-  for src_rel, dst_rel in _ARTIFACT_PATH_TO_DST.iteritems():
+  for src_rel, dst_rel in _ARTIFACT_PATH_TO_DST.items():
     src_full = os.path.join(src_root, src_rel)
     dst_full = os.path.join(dst_root, dst_rel)
     if not os.path.exists(src_full):
-      print 'Unable to find artifact: ', str(src_full)
+      print('Unable to find artifact: ', str(src_full))
       sys.exit(1)
     CopyPath(src_full, dst_full)
 

tools/fuchsia/gen_package.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/fuchsia/gen_repo.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

tools/fuchsia/make_build_info.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be