old_contents: # Copyright 2013-2021 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)
  
  from spack import *
  
  
  class PyBackcall(PythonPackage):
      """Specifications for callback functions passed in to an API"""
  
      homepage = "https://github.com/takluyver/backcall"
      pypi = "backcall/backcall-0.1.0.tar.gz"
  
      version('0.1.0', sha256='38ecd85be2c1e78f77fd91700c76e14667dc21e2713b63876c0eb901196e01e4')
  
new_contents: # Copyright 2013-2021 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)
  
  from spack import *
  
  
  class PyBackcall(PythonPackage):
      """Specifications for callback functions passed in to an API"""
  
      homepage = "https://github.com/takluyver/backcall"
      pypi = "backcall/backcall-0.1.0.tar.gz"
  
      version('0.2.0', sha256='5cbdbf27be5e7cfadb448baf0aa95508f91f2bbc6c6437cd9cd06e2a4c215e1e')
      version('0.1.0', sha256='38ecd85be2c1e78f77fd91700c76e14667dc21e2713b63876c0eb901196e01e4')
  
subject: Add version 0.2.0 (#26487)