def _valid_name(s, exprs):
    i = 0
    check = ' '.join(exprs)
    while True:
        n = s.replace(':','%d'%i)
        if n not in check:
            return n
        i += 1
A resize handler for north resizing.
dataset/ETHPy150Open OpenMDAO/OpenMDAO/openmdao/components/exec_comp.py/_valid_name--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/docking/q_dock_frame.py/QDockFrame._resizeNorth