old_contents: from . import development, testing, production
  
  
  def set_app_config_keys(app, settings):
      """Load all flask.Flask config vars.
  
      :app: a flask.Flask object
      :settings: a module with config vars
      :returns: None
  
      """
      # create a unique dict with all config vars
      all_config_vars = dict(
          list(settings.FLASK_VARS.items()) +
          list(settings.FLASK_JWT_VARS.items()) +
          list(settings.DB_CONNECTION.items())
      )
  
      for key, value in all_config_vars.items:
          app.config[key] = value
  
  
  def development_config(app):
      """Call the function responsable by load config vars
      using 'development' settings.
  
      :app: a flask.Flask object
      :returns: None
  
      """
      set_app_config_keys(app, development)
  
  
  def testing_config(app):
      """Call the function responsable by load config vars
      using 'testing' settings.
  
      :app: a flask.Flask object
      :returns: None
  
      """
      set_app_config_keys(app, testing)
  
  
  def production_config(app):
      """Call the function responsable by load config vars
      using 'production' settings.
  
      :app: a flask.Flask object
      :returns: None
  
      """
      set_app_config_keys(app, production)
  
  # Yep, I know I could use lambdas...
  config = {
      'development': development_config,
      'testing': testing_config,
      'production': production_config,
      'default': development_config,
  }
  
new_contents: from . import development, testing, production
  
  
  def set_app_config_keys(app, settings):
      """Load all flask.Flask config vars.
  
      :app: a flask.Flask object
      :settings: a module with config vars
      :returns: None
  
      """
      # create a unique dict with all config vars
      all_config_vars = dict(
          list(settings.FLASK_VARS.items()) +
          list(settings.FLASK_JWT_VARS.items()) +
          list(settings.DB_CONNECTION.items())
      )
  
      for key, value in all_config_vars.items():
          app.config[key] = value
  
  
  def development_config(app):
      """Call the function responsable by load config vars
      using 'development' settings.
  
      :app: a flask.Flask object
      :returns: None
  
      """
      set_app_config_keys(app, development)
  
  
  def testing_config(app):
      """Call the function responsable by load config vars
      using 'testing' settings.
  
      :app: a flask.Flask object
      :returns: None
  
      """
      set_app_config_keys(app, testing)
  
  
  def production_config(app):
      """Call the function responsable by load config vars
      using 'production' settings.
  
      :app: a flask.Flask object
      :returns: None
  
      """
      set_app_config_keys(app, production)
  
  # Yep, I know I could use lambdas...
  config = {
      'development': development_config,
      'testing': testing_config,
      'production': production_config,
      'default': development_config,
  }
  
subject: call the method