old_contents: #     Copyright 2019, Kay Hayen, mailto:kay.hayen@gmail.com
  #
  #     Python test originally created or extracted from other peoples work. The
  #     parts from me are licensed as below. It is at least Free Software where
  #     it's copied from other people. In these cases, that will normally be
  #     indicated.
  #
  #     Licensed under the Apache License, Version 2.0 (the "License");
  #     you may not use this file except in compliance with the License.
  #     You may obtain a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #     Unless required by applicable law or agreed to in writing, software
  #     distributed under the License is distributed on an "AS IS" BASIS,
  #     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #     See the License for the specific language governing permissions and
  #     limitations under the License.
  #
  
  # Python3 changed module name.
  try:
      import Tkinter as tkinter
  except ImportError:
      import tkinter
  
  assert tkinter
  
new_contents: #     Copyright 2019, Kay Hayen, mailto:kay.hayen@gmail.com
  #
  #     Python test originally created or extracted from other peoples work. The
  #     parts from me are licensed as below. It is at least Free Software where
  #     it's copied from other people. In these cases, that will normally be
  #     indicated.
  #
  #     Licensed under the Apache License, Version 2.0 (the "License");
  #     you may not use this file except in compliance with the License.
  #     You may obtain a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #     Unless required by applicable law or agreed to in writing, software
  #     distributed under the License is distributed on an "AS IS" BASIS,
  #     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #     See the License for the specific language governing permissions and
  #     limitations under the License.
  #
  
  # Python3 changed module name.
  try:
      import Tkinter as tkinter
  except ImportError:
      import tkinter
  
  try:
      root = tkinter.Tk()  # this will fail in absence of TCL
  except:
      root = None
  
  assert root
  
subject: Update TkInterUsing.py (#259)