new_contents: #!/usr/bin/env python
  
  import os
  import subprocess
  import sys
  
  import click
  
  
  @click.command()
  @click.version_option()
  @click.argument('requirements_file', type=click.Path(exists=True))
  @click.pass_context
  def pydockerize(ctx, requirements_file):
      """Create Docker images for Python apps"""
      print('requirements_file = %r' % requirements_file)
      if not os.path.exists('Dockerfile'):
          write_dockerfile()
  
  
  def write_dockerfile():
      print('write_dockerfile')
  
  
  if __name__ == '__main__':
      pydockerize()
  
subject: Add pydockerize.py