docs: def _generate_lambda_handler(config, output='.slam/handler.py'):
      """Generate a handler.py file for the lambda function start up."""
      # Determine what the start up code is. The default is to just run the
      # function, but it can be overriden by a plugin such as wsgi for a more
      # elaborated way to run the function.
      run_function = _run_lambda_function
      for name, plugin in plugins.items():
          if name in config and hasattr(plugin, 'run_lambda_function'):
              run_function = plugin.run_lambda_function
      run_code = ''.join(inspect.getsourcelines(run_function)[0][1:])
  
      # generate handler.py
      with open(os.path.join(os.path.dirname(__file__),
                             'templates/handler.py.template')) as f:
          template = f.read()
      template = render_template(template, module=config['function']['module'],
                                 app=config['function']['app'],
                                 run_lambda_function=run_code,
                                 config_json=json.dumps(config,
                                                        separators=(',', ':')))
      with open(output, 'wt') as f:
          f.write(template + '\n')