Improve Python tree-shaking

third_party/python/Lib/test/test_email/__init__.py

@@ -5,7 +5,8 @@ import email
 from email.message import Message
 from email._policybase import compat32
 from test.support import load_package_tests
-from test.test_email import __file__ as landmark
+
+landmark = __file__
 
 # Load all tests in package
 def load_tests(*args):

third_party/python/Lib/test/test_email/test_email.py

@@ -42,6 +42,7 @@ from email import quoprimime
 
 from test.support import unlink, start_threads
 from test.test_email import openfile, TestEmailBase
+from encodings import iso2022_jp
 
 # These imports are documented to work, but we are testing them using a
 # different path, so we import them here just to make sure they are importable.