old_contents: #!/usr/bin/env python3
  
  """Initialize a newly-created repository."""
  
  
  import sys
  import os
  import shutil
  
  BOILERPLATE = (
      '.travis.yml',
      'AUTHORS',
      'CITATION',
      'CONTRIBUTING.md',
      'README.md',
      '_config.yml',
      '_episodes/01-introduction.md',
      '_extras/about.md',
      '_extras/discuss.md',
      '_extras/figures.md',
      '_extras/guide.md',
      'aio.md',
      'index.md',
      'reference.md',
      'setup.md',
  )
  
  
  def main():
      """Check for collisions, then create."""
  
      # Check.
      errors = False
      for path in BOILERPLATE:
          if os.path.exists(path):
              print('Warning: {0} already exists.'.format(path), file=sys.stderr)
              errors = True
      if errors:
          print('**Exiting without creating files.**', file=sys.stderr)
          sys.exit(1)
  
      # Create.
      for path in BOILERPLATE:
          shutil.copyfile(
              "bin/boilerplate/{}".format(path),
              path
          )
  
  
  if __name__ == '__main__':
      main()
  
new_contents: #!/usr/bin/env python3
  
  """Initialize a newly-created repository."""
  
  
  import sys
  import os
  import shutil
  
  BOILERPLATE = (
      '.travis.yml',
      'AUTHORS',
      'CITATION',
      'CODE_OF_CONDUCT.md',
      'CONTRIBUTING.md',
      'README.md',
      '_config.yml',
      '_episodes/01-introduction.md',
      '_extras/about.md',
      '_extras/discuss.md',
      '_extras/figures.md',
      '_extras/guide.md',
      'aio.md',
      'index.md',
      'reference.md',
      'setup.md',
  )
  
  
  def main():
      """Check for collisions, then create."""
  
      # Check.
      errors = False
      for path in BOILERPLATE:
          if os.path.exists(path):
              print('Warning: {0} already exists.'.format(path), file=sys.stderr)
              errors = True
      if errors:
          print('**Exiting without creating files.**', file=sys.stderr)
          sys.exit(1)
  
      # Create.
      for path in BOILERPLATE:
          shutil.copyfile(
              "bin/boilerplate/{}".format(path),
              path
          )
  
  
  if __name__ == '__main__':
      main()
  
subject: Add CODE_OF_CONDUCT.md to boilerplate