cpython/Lib/test/test_asyncio/echo3.py

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import os
if __name__ == '__main__':
while True:
buf = os.read(0, 1024)
if not buf:
break
try:
os.write(1, b'OUT:'+buf)
except OSError as ex:
os.write(2, b'ERR:' + ex.__class__.__name__.encode('ascii'))