def _error_on_bad_paths(fs, paths):
    for path in paths:
        if path == '-':
            return
        if fs.exists(path):
            return

    raise ValueError("At least one valid path is required. "
                     "None found in %s" % paths)
Send the window to the top of the Z order.
dataset/ETHPy150Open Yelp/mrjob/mrjob/sim.py/_error_on_bad_paths--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/widgets/window.py/Window.send_to_front