Migrate all Python hashbangs to Python 3 (#27838)

Migrates all `#!/usr/bin/env python` hashbang lines to use python3.

Also updates the licence tool to treat python3 scripts on par with
python 2 scripts.

Issue: flutter/flutter#83043

Author: cbracken

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 +13,9 @@
 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
@@ -84,7 +84,7 @@ 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))
 
     test_command = [absolute_test_path]
 

build/git_revision.py

@@ -1,13 +1,13 @@
-#!/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.

ci/firebase_testlab.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

ci/licenses_golden/tool_signature

@@ -1,2 +1,2 @@
-Signature: 17e2c7f169a5804317b8f79ab1f8a838
+Signature: fdaf33383efb94fa6bbc158cbc25635c
 

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

@@ -1,4 +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.