diff --git a/pre-upload.py b/pre-upload.py
index f897ccc..7330aec 100755
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -500,12 +500,16 @@
       # Go has no line length limit.
       # https://golang.org/doc/effective_go.html#formatting
       r'.*\.go$',
+      # Python does its own long line checks via pylint.
+      r'.*\.py$',
   ]
 
   DEFAULT_MAX_LENGTHS = [
       # Java's line length limit is 100 chars.
       # https://chromium.googlesource.com/chromium/src/+/master/styleguide/java/java.md
       (r'.*\.java$', 100),
+      # Rust's line length limit is 100 chars.
+      (r'.*\.rs$', 100),
   ]
 
   MAX_LEN = 80
diff --git a/pre-upload_unittest.py b/pre-upload_unittest.py
index 384af0e..71b4337 100755
--- a/pre-upload_unittest.py
+++ b/pre-upload_unittest.py
@@ -99,7 +99,8 @@
     self.diff_mock = self.PatchObject(pre_upload, '_get_file_diff')
 
   def testCheck(self):
-    self.PatchObject(pre_upload, '_get_affected_files', return_value=['x.py'])
+    path = 'x.cc'
+    self.PatchObject(pre_upload, '_get_affected_files', return_value=[path])
     self.diff_mock.return_value = [
         (1, u'x' * 80),                      # OK
         (2, '\x80' * 80),                    # OK
@@ -114,7 +115,7 @@
     self.assertTrue(failure)
     self.assertEqual('Found lines longer than the limit (first 5 shown):',
                      failure.msg)
-    self.assertEqual(['x.py, line %d, 81 chars, over 80 chars' %
+    self.assertEqual([path + ', line %d, 81 chars, over 80 chars' %
                       x for x in [3, 4, 8]],
                      failure.items)
 
@@ -163,7 +164,7 @@
   def testExcludeOptions(self):
     self.PatchObject(pre_upload,
                      '_get_affected_files',
-                     return_value=['foo.py'])
+                     return_value=['foo.cc'])
     self.diff_mock.return_value = [(1, u'x' * 81)]
     self.assertTrue(pre_upload._check_no_long_lines(
         ProjectNamed('PROJECT'), 'COMMIT'))