chore: remove py2 compatibility code (#40375)

script/lib/config.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-from __future__ import print_function
 import os
 import sys
 

script/lib/git.py

@@ -6,8 +6,6 @@ Everything here should be project agnostic: it shouldn't rely on project's
 structure, or make assumptions about the passed arguments or calls' outcomes.
 """
 
-from __future__ import unicode_literals
-
 import io
 import os
 import posixpath
@@ -229,14 +227,6 @@ def remove_patch_filename(patch):
     force_keep_next_line = l.startswith('Subject: ')
 
 
-def to_utf8(patch):
-  """Python 2/3 compatibility: unicode has been renamed to str in Python3"""
-  if sys.version_info[0] >= 3:
-    return str(patch, "utf-8")
-
-  return unicode(patch, "utf-8")
-
-
 def export_patches(repo, out_dir, patch_range=None, dry_run=False):
   if not os.path.exists(repo):
     sys.stderr.write(
@@ -263,7 +253,7 @@ def export_patches(repo, out_dir, patch_range=None, dry_run=False):
     for patch in patches:
       filename = get_file_name(patch)
       filepath = posixpath.join(out_dir, filename)
-      existing_patch = to_utf8(io.open(filepath, 'rb').read())
+      existing_patch = str(io.open(filepath, 'rb').read(), 'utf-8')
       formatted_patch = join_patch(patch)
       if formatted_patch != existing_patch:
         bad_patches.append(filename)

script/lib/native_tests.py

@@ -1,4 +1,4 @@
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import os
 import subprocess
@@ -10,11 +10,6 @@ PYYAML_LIB_DIR = os.path.join(SRC_DIR, 'third_party', 'pyyaml', 'lib')
 sys.path.append(PYYAML_LIB_DIR)
 import yaml  #pylint: disable=wrong-import-position,wrong-import-order
 
-try:
-  basestring        # Python 2
-except NameError:   # Python 3
-  basestring = str  # pylint: disable=redefined-builtin
-
 
 class Verbosity:
   CHATTY = 'chatty'  # stdout and stderr
@@ -148,7 +143,7 @@ class TestsList():
     if isinstance(value, dict):
       return value
 
-    if isinstance(value, basestring):
+    if isinstance(value, str):
       return {value: None}
 
     raise AssertionError("unexpected shorthand type: {}".format(type(value)))

script/lib/util.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-from __future__ import print_function
 import contextlib
 import errno
 import json
@@ -8,11 +7,7 @@ import os
 import shutil
 import subprocess
 import sys
-# Python 3 / 2 compat import
-try:
-  from urllib.request import urlopen
-except ImportError:
-  from urllib2 import urlopen
+from urllib.request import urlopen
 import zipfile
 
 # from lib.config import is_verbose_mode