Created
July 27, 2017 08:35
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| import argparse, socket | |
| from datetime import datetime | |
| MAX_BYTES = 65535 | |
| def server(port): | |
| sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM) | |
| sock.bind(('127.0.0.1',port)) | |
| print('Listening at {}'.format(sock.getsockname())) | |
| while True: | |
| data, address = sock.recvfrom(MAX_BYTES) | |
| text = data.decode('ascii') | |
| print('The client at {} says {!r}'.format(address,text)) | |
| text = 'Your data was {} bytes long.'.format(len(data)) | |
| data = text.encode('ascii') | |
| sock.sendto(data,address) | |
| def client(port): | |
| sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | |
| text = 'The time is {}'.format(datetime.now()) | |
| data = text.encode('ascii') | |
| sock.sendto(data,('127.0.0.1',port)) | |
| print('The OS assigned me the address {}'.format(sock.getsockname())) | |
| data, address = sock.recvfrom(MAX_BYTES) | |
| text = data.decode('ascii') | |
| print('The server {} replied {!r}'.format(address,text)) | |
| if __name__ == '__main__': | |
| choices = {'client':client,'server':server} | |
| parser = argparse.ArgumentParser(description='Send and receive UDP locally') | |
| parser.add_argument('role',choices=choices,help='which role to play') | |
| parser.add_argument('-p',metavar='PORT',type=int,default=1060,help='UDP port (default 1060)') | |
| args = parser.parse_args() | |
| function = choices[args.role] | |
| function(args.p) |
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