(master=None)
return master
If master is not None, itself is returned. If master is None,
    the default master is returned if there is one, otherwise a new
    master is created and returned.

    If it is not allowed to use the default root and master is None,
    RuntimeError is raised.
If master is not None, itself is returned. If master is None,
    the default master is returned if there is one, otherwise a new
    master is created and returned.
If master is not None itself is returned . If master is None the default master is returned if there is one otherwise a new master is created and returned .
def setup_master(master=None):
    """If master is not None, itself is returned. If master is None,
    the default master is returned if there is one, otherwise a new
    master is created and returned.

    If it is not allowed to use the default root and master is None,
    RuntimeError is raised."""
    if master is None:
        master = tkinter._get_default_root()
    return master
def setup_master ( master = None ) : if master is None : master = tkinter . _get_default_root ( ) return master