poplib.py 文件源码

def __init__(self, host, port = POP3_SSL_PORT, keyfile = None, certfile = None):
            self.host = host
            self.port = port
            self.keyfile = keyfile
            self.certfile = certfile
            self.buffer = ""
            msg = "getaddrinfo returns an empty list"
            self.sock = None
            for res in socket.getaddrinfo(self.host, self.port, 0, socket.SOCK_STREAM):
                af, socktype, proto, canonname, sa = res
                try:
                    self.sock = socket.socket(af, socktype, proto)
                    self.sock.connect(sa)
                except socket.error, msg:
                    if self.sock:
                        self.sock.close()
                    self.sock = None
                    continue
                break
            if not self.sock:
                raise socket.error, msg
            self.file = self.sock.makefile('rb')
            self.sslobj = ssl.wrap_socket(self.sock, self.keyfile, self.certfile)
            self._debugging = 0
            self.welcome = self._getresp()