ftplib.py 文件源码

def connect(self, host='', port=0, timeout=-999):
        '''Connect to host.  Arguments are:
         - host: hostname to connect to (string, default previous host)
         - port: port to connect to (integer, default previous port)
        '''
        if host != '':
            self.host = host
        if port > 0:
            self.port = port
        if timeout != -999:
            self.timeout = timeout
        self.sock = socket.create_connection((self.host, self.port), self.timeout)
        self.af = self.sock.family
        self.file = self.sock.makefile('rb')
        self.welcome = self.getresp()
        return self.welcome