()
return Turtle._screen
Return the singleton screen object.
    If none exists at the moment, create a new one and return it,
    else return the existing one.
Return the singleton screen object.
    If none exists at the moment, create a new one and return it,
    else return the existing one.
Return the singleton screen object . If none exists at the moment create a new one and return it else return the existing one .
def Screen():
    """Return the singleton screen object.
    If none exists at the moment, create a new one and return it,
    else return the existing one."""
    if Turtle._screen is None:
        Turtle._screen = _Screen()
    return Turtle._screen
def Screen ( ) : if Turtle . _screen is None : Turtle . _screen = _Screen ( ) return Turtle . _screen