code: def update(self, catalog=None, dependencies=None, allow_overwrite=False):
          '''
          Convenience method to update this Di instance with the specified contents.
  
          :param catalog: ICatalog supporting class or mapping
          :type catalog: ICatalog or collections.Mapping
          :param dependencies: Mapping of dependencies
          :type dependencies: collections.Mapping
          :param allow_overwrite: If True, allow overwriting existing keys. Only applies to providers.
          :type allow_overwrite: bool
          '''
          if catalog:
              self._providers.update(catalog, allow_overwrite=allow_overwrite)
          if dependencies:
              self._dependencies.update(dependenciesf update(self, catalog=None, dependencies=None, allow_overwrite=False):
          '''
          Convenience method to update this Di instance with the specified contents.
  
          :param catalog: ICatalog supporting class or mapping
          :type catalog: ICatalog or collections.Mapping
          :param dependencies: Mapping of dependencies
          :type dependencies: collections.Mapping
          :param allow_overwrite: If True, allow overwriting existing keys. Only applies to providers.
          :type allow_overwrite: bool
          '''
          if catalog:
              self._providers.update(catalog, allow_overwrite=allow_overwrite)
          if dependencies:
              self._dependencies.update(dependencies)
docs: Convenience method to update this Di instance with the specified contents.
  
          :param catalog: ICatalog supporting class or mapping
          :type catalog: ICatalog or collections.Mapping
          :param dependencies: Mapping of dependencies
          :type dependencies: collections.Mapping
          :param allow_overwrite: If True, allow overwriting existing keys. Only applies to providers.
          :type allow_overwrite: bool