問題描述

我正在嘗試從 FTP 服務器獲取所有目錄的名稱，并將它們以分層順序存儲在多維列表或字典中

I am trying to to get all directories' name from an FTP server and store them in hierarchical order in a multidimensional list or dict

例如，一個包含以下結構的服務器:

So for example, a server that contains the following structure:

/www/
    mysite.com
        images
            png
            jpg

在腳本的末尾，會給我一個列表，例如

at the end of the script, would give me a list such as

['/www/'
  ['mysite.com'
    ['images'
      ['png'],
      ['jpg']
    ]
  ]
]

我嘗試過使用這樣的遞歸函數:def 遍歷(目錄):FTP.dir(目錄，遍歷)

I have tried using a recursive function like so: def traverse(dir): FTP.dir(dir, traverse)

FTP.dir 以這種格式返回行:

FTP.dir returns lines in this format:

drwxr-xr-x    5 leavesc1 leavesc1     4096 Nov 29 20:52 mysite.com

這樣做 line[56:] 只會給我目錄名稱(mysite.com).我在遞歸函數中使用它.

so doing line[56:] will give me just the directory name(mysite.com). I use this in the recursive function.

但我無法讓它工作.我嘗試了許多不同的方法，但無法讓它發(fā)揮作用.還有很多 FTP 錯誤(找不到目錄 - 這是一個邏輯問題，有時服務器返回意外錯誤，沒有留下日志，我無法調試)

But i cannot get it to work. I've tried many different approaches and can't get it to work. Lots of FTP errors as well (either can't find the directory - which is a logical issue, and sometimes unexpected errors returned by the server, which leaves no log and i can't debug)

底線問題:如何從 FTP 服務器獲取分層目錄列表?

bottom line question: How to get a hierarchical directory listing from an FTP server?

推薦答案

這是一個幼稚而緩慢的實現.它很慢，因為它嘗試對每個目錄條目進行 CWD 以確定它是目錄還是文件，但這有效.可以通過解析 LIST 命令輸出來優(yōu)化它，但這很大程度上依賴于服務器實現.

Here is a naive and slow implementation. It is slow because it tries to CWD to each directory entry to determine if it is a directory or a file, but this works. One could optimize it by parsing LIST command output, but this is strongly server-implementation dependent.

import ftplib

def traverse(ftp, depth=0):
    """
    return a recursive listing of an ftp server contents (starting
    from the current directory)

    listing is returned as a recursive dictionary, where each key
    contains a contents of the subdirectory or None if it corresponds
    to a file.

    @param ftp: ftplib.FTP object
    """
    if depth > 10:
        return ['depth > 10']
    level = {}
    for entry in (path for path in ftp.nlst() if path not in ('.', '..')):
        try:
            ftp.cwd(entry)
            level[entry] = traverse(ftp, depth+1)
            ftp.cwd('..')
        except ftplib.error_perm:
            level[entry] = None
    return level

def main():
    ftp = ftplib.FTP("localhost")
    ftp.connect()
    ftp.login()
    ftp.set_pasv(True)

    print traverse(ftp)

if __name__ == '__main__':
    main()

這篇關于遍歷 FTP 列表的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！