code: def load_extension(self, name):
          
  
          if name in self.__extensions:
              raise errors.ExtensionAlreadyLoaded(name)
  
          try:
              lib = importlib.import_module(name)
          except ImportError as e:
              raise errors.ExtensionNotFound(name, e) from e
          else:
              self._load_from_module_spec(lib, name)
docs: Loads an extension.
  
          An extension is a python module that contains commands, cogs, or
          listeners.
  
          An extension must have a global function, ``setup`` defined as
          the entry point on what to do when the extension is loaded. This entry
          point must have a single argument, the ``bot``.
  
          Parameters
          ------------
          name: :class:`str`
              The extension name to load. It must be dot separated like
              regular Python imports if accessing a sub-module. e.g.
              ``foo.test`` if you want to import ``foo/test.py``.
  
          Raises
          --------
          ExtensionNotFound
              The extension could not be imported.
          ExtensionAlreadyLoaded
              The extension is already loaded.
          NoEntryPointError
              The extension does not have a setup function.
          ExtensionFailed
              The extension setup function had an execution error.