new_contents: # Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
  # Spack Project Developers. See the top-level COPYRIGHT file for details.
  #
  # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  
  
  class PyNltk(PythonPackage):
      """The Natural Language Toolkit (NLTK) is a Python package for
      natural language processing."""
  
      homepage = "https://www.nltk.org/"
      url      = "https://pypi.io/packages/source/n/nltk/nltk-3.5.zip"
  
      version('3.5', sha256='845365449cd8c5f9731f7cb9f8bd6fd0767553b9d53af9eb1b3abf7700936b35')
  
      depends_on('python@3.5:', type=('build', 'run'))
      depends_on('py-setuptools', type='build')
      depends_on('py-click', type=('build', 'run'))
      depends_on('py-regex', type=('build', 'run'))
      depends_on('py-tqdm', type=('build', 'run'))
  
      # May require additional third-party software:
      # https://github.com/nltk/nltk/wiki/Installing-Third-Party-Software
  
subject: add new package (#16290)