code: def uninstall_handler(library, session, event_type, handler, user_handle=None):
      
      set_user_handle_type(library, user_handle)
      if user_handle != None:
           user_handle = byref(user_handle)
      return library.viUninstallHandler(session, event_type, handler, user_handle)
docs: Uninstalls handlers for events.
  
      Corresponds to viUninstallHandler function of the VISA library.
  
      :param library: the visa library wrapped by ctypes.
      :param session: Unique logical identifier to a session.
      :param event_type: Logical event identifier.
      :param handler: Interpreted as a valid reference to a handler to be uninstalled by a client application.
      :param user_handle: The user_handle (a ctypes object) in the returned value from install_handler.
      :return: return value of the library call.
      :rtype: :class:`pyvisa.constants.StatusCode`