#NEWLINE# def _subsystem( self , name ) : #NEWLINE# #INDENT# "\n        Returns a reference to a named subsystem that is a direct or an indirect\n        subsystem of the this system.  Raises an exception if the given name\n        doesn't reference a subsystem.\n\n        Args\n        ----\n        name : str\n            Name of the subsystem to retrieve.\n\n        Returns\n        -------\n        `System`\n            A reference to the named subsystem.\n        " #NEWLINE# s = self #NEWLINE# for part in name . split ( '.' ) : #NEWLINE# #INDENT# s = s . _subsystems [ part ] #NEWLINE# #UNINDENT# return name