autoreload.py 文件源码

def wait():
    """Wait for a watched file to change, then restart the process.

    Intended to be used at the end of scripts like unit test runners,
    to run the tests again after any source file changes (but see also
    the command-line interface in `main`)
    """
    io_loop = ioloop.IOLoop()
    start(io_loop)
    io_loop.start()