[ftplib]quit后login报错问题

[marvin0920]

IDLE 2.6.4      
>>> from ftplib import FTP
>>> host = '192.168.1.4'
>>> port = '21'
>>> f = FTP()
>>> f.connect(host,port)
'220 Serv-U FTP Server v6.0 for WinSock ready...'
>>> f.login('admin','admin123')
'230 User logged in, proceed.'
>>> f.quit()
'221 Goodbye!'
>>> f.login('admin','admin123')

Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    f.login('admin','admin123')
  File "D:\Python2.6\lib\ftplib.py", line 372, in login
    resp = self.sendcmd('USER ' + user)
  File "D:\Python2.6\lib\ftplib.py", line 242, in sendcmd
    self.putcmd(cmd)
  File "D:\Python2.6\lib\ftplib.py", line 177, in putcmd
    self.putline(line)
  File "D:\Python2.6\lib\ftplib.py", line 172, in putline
    self.sock.sendall(line)
AttributeError: 'NoneType' object has no attribute 'sendall'
>>> f
<ftplib.FTP instance at 0x011F0B20>

一旦quit()/close()后，再login就报错

[angel_su]

另起个实例吧，文档有说明：

FTP.close()¶
Close the connection unilaterally. This should not be applied to an already closed connection such as after a successful call to quit(). After this call the FTP instance should not be used any more (after a call to close() or quit() you cannot reopen the connection by issuing another login() method).