以Python递归列出FTP目录

Question

I'm having difficulty retrieving a list of directories on a remote FTP site. This answer does not work (I get no output, it appears to hang).

Here's the simplest implementation I can think of - it should just print out the full path of every directory it finds:

import ftplib

def ftp_walk(ftp):    
print 'Path:', ftp.pwd()
    dirs = ftp.nlst()
    for item in (path for path in dirs if path not in ('.', '..')):
        try:
            ftp.cwd(item)
            print 'Changed to', ftp.pwd()
            ftp_walk(ftp)
            ftp.cwd('..')
        except Exception, e:
            print item, e

ftp = ftplib.FTP('ftp.site.com')                                        
ftp.login('user', 'pass')
ftp.cwd('1')
ftp_walk(ftp)

My directory structure is:

1/
 1-1/
   1-2/
 1-2/
 1-3/
 1-4

However, it only outputs the following. It suggests that the working directory is changed once to a new subdirectory, but when ftp_walk() is called with the new cwd, it doesn't go any further:

> Path: 1/
> Changed to 1-1/

Answer 1

在ftp.login('user', 'pass')和构造函数之后，需要调用ftp.connect() 。

Answer 2

Well I suppose the user you are logging in has access to all that structure, because otherwise it will return an error and won't list that specific directory.

If you're getting an exception, please put it here. Maybe you should try..finally your cwd so that it won't get lost. Can I suggest:

    try:
        ftp.cwd(item)
        print 'Changed to', ftp.pwd()
        try:
            ftp_walk(ftp)
        finally:
            ftp.cwd('..')
    except ftplib.error_perm, e:
        print item, e