old_contents: #!/usr/bin/env python3
  # Copyright (c) 2016 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #
  # Helper script to create the cache
  # (see BitcoinTestFramework.setup_chain)
  #
  
  from test_framework.test_framework import BitcoinTestFramework
  
  class CreateCache(BitcoinTestFramework):
  
      def setup_network(self):
          # Don't setup any test nodes
          self.options.noshutdown = True
  
      def run_test(self):
          pass
  
  if __name__ == '__main__':
      CreateCache().main()
  
new_contents: #!/usr/bin/env python3
  # Copyright (c) 2016 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #
  # Helper script to create the cache
  # (see BitcoinTestFramework.setup_chain)
  #
  
  from test_framework.test_framework import BitcoinTestFramework
  
  class CreateCache(BitcoinTestFramework):
  
      def __init__(self):
          super().__init__()
  
          # Test network and test nodes are not required:
          self.num_nodes = 0
          self.nodes = []
  
      def setup_network(self):
          pass
  
      def run_test(self):
          pass
  
  if __name__ == '__main__':
      CreateCache().main()
  
subject: Delete temp dir when done