python – IRC bot无法加入频道

import socket

irc = 'irc.hack3r.com'
port = 6667
channel = '#chat'
sck = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sck.connect((irc,port))
sck.send('NICK supaBOTrn')
sck.send('USER supaBOT supaBOT supaBOT :supaBOT Scriptrn')
sck.send('JOIN #chat' + 'rn')
data = ''
while True:
     data = sck.recv(4096)
     if data.find('PING') != -1:
        sck.send('PONG ' + data.split() [1] + 'rn')
        print data

print sck.recv(4096)

当我连接到服务器时,我无法加入频道,我收到此错误：

“451 JOIN :You have not registered”