code: def init_app(self, app, decorators=None):
          
          self.decorators = decorators or self.decorators
          self.app = app
  
          self.load_config(app)
          # self.load_apispec(app)
          if self.template_file is not None:
              self.template = self.load_swagger_file(self.template_file)
          self.register_views(app)
          self.add_headers(app)
  
          if self.parse:
              if RequestParser is None:
                  raise RuntimeError('Please install flask_restful')
              self.parsers = {}
              self.schemas = {}
              self.format_checker = jsonschema.FormatChecker()
              self.parse_request(app)
  
          self._configured = True
          app.swag = self
docs: Initialize the app with Swagger plugin