old_contents: from __future__ import absolute_import, division, print_function, with_statement
  from tornado.test.util import unittest
  
  
  class ImportTest(unittest.TestCase):
      def test_import_everything(self):
          # Some of our modules are not otherwise tested.  Import them
          # all (unless they have external dependencies) here to at
          # least ensure that there are no syntax errors.
          import tornado.auth
          import tornado.autoreload
          # import tornado.curl_httpclient  # depends on pycurl
          import tornado.escape
          import tornado.httpclient
          import tornado.httpserver
          import tornado.httputil
          import tornado.ioloop
          import tornado.iostream
          import tornado.locale
          import tornado.options
          import tornado.netutil
          # import tornado.platform.twisted # depends on twisted
          import tornado.process
          import tornado.simple_httpclient
          import tornado.stack_context
          import tornado.template
          import tornado.testing
          import tornado.util
          import tornado.web
          import tornado.websocket
          import tornado.wsgi
  
      # for modules with dependencies, if those dependencies can be loaded,
      # load them too.
  
      def test_import_pycurl(self):
          try:
              import pycurl
          except ImportError:
              pass
          else:
              import tornado.curl_httpclient
  
      def test_import_twisted(self):
          try:
              import twisted
          except ImportError:
              pass
          else:
              import tornado.platform.twisted
  
new_contents: from __future__ import absolute_import, division, print_function, with_statement
  from tornado.test.util import unittest
  
  
  class ImportTest(unittest.TestCase):
      def test_import_everything(self):
          # Some of our modules are not otherwise tested.  Import them
          # all (unless they have external dependencies) here to at
          # least ensure that there are no syntax errors.
          import tornado.auth
          import tornado.autoreload
          import tornado.concurrent
          # import tornado.curl_httpclient  # depends on pycurl
          import tornado.escape
          import tornado.gen
          import tornado.httpclient
          import tornado.httpserver
          import tornado.httputil
          import tornado.ioloop
          import tornado.iostream
          import tornado.locale
          import tornado.log
          import tornado.netutil
          import tornado.options
          import tornado.process
          import tornado.simple_httpclient
          import tornado.stack_context
          import tornado.tcpserver
          import tornado.template
          import tornado.testing
          import tornado.util
          import tornado.web
          import tornado.websocket
          import tornado.wsgi
  
      # for modules with dependencies, if those dependencies can be loaded,
      # load them too.
  
      def test_import_pycurl(self):
          try:
              import pycurl
          except ImportError:
              pass
          else:
              import tornado.curl_httpclient
  
subject: Update import_test.