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import socket
import sys
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
addr = ('localhost', int(sys.argv[1]))
print('listening on %s port %s' % addr, file=sys.stderr)
sock.bind(addr)
while True:
buf, raddr = sock.recvfrom(4096)
print(buf.decode("utf-8"), file=sys.stderr)
if buf:
sent = sock.sendto(b'this is the host!', raddr)
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