[Python-3000] python3000 udp problem

[Long Ge]

import socket
if __name__ == '__main__':
    print("main")
    udp = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
    udp.sendto("1",0,('127.0.0.1',3722))
    udp.close()


*output:*
main
Traceback (most recent call last):
  File "C:\Python30\Projects\udp.py", line 6, in <module>
    udp.sendto("1",0,('127.0.0.1',3722))
TypeError: sendto() argument 1 must be bytes or read-only buffer, not str

what is the problem about argument 1?

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