Lib/test/test_asyncio/echo3.py


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import os

if __name__ == '__main__':
    while True:
        buf = os.read(0, 1024)
        try:
            os.write(1, b'OUT:'+buf)
        except OSError as ex:
            os.write(2, b'ERR:' + ex.__class__.__name__.encode('ascii'))