問題描述

我正在嘗試從 FTP 服務(wù)器下載大量共享公共字符串 (DEM) 的文件.這些文件嵌套在多個(gè)目錄中.例如，Adair/DEM* 和 Adams/DEM*

I'm trying to download a large number of files that all share a common string (DEM) from an FTP sever. These files are nested inside multiple directories. For example, Adair/DEM* and Adams/DEM*

FTP 服務(wù)器位于此處:ftp://ftp.igsb.uiowa.edu/gis_library/counties/，不需要用戶名和密碼.所以，我想遍歷每個(gè)縣并下載包含字符串 DEM 的文件.

The FTP sever is located here: ftp://ftp.igsb.uiowa.edu/gis_library/counties/ and requires no username and password. So, I'd like to go through each county and download the files containing the string DEM.

我在這里閱讀了很多關(guān)于 Stack Overflow 的問題和 Python 的文檔，但無法弄清楚如何使用 ftplib.FTP() 在沒有用戶名和密碼的情況下進(jìn)入站點(diǎn)(其中不是必需的)，我不知道如何在 ftplib 或 urllib 中 grep 或使用 glob.glob.

I've read many questions here on Stack Overflow and the documentation from Python, but cannot figure out how to use ftplib.FTP() to get into the site without a username and password (which is not required), and I can't figure out how to grep or use glob.glob inside of ftplib or urllib.

提前感謝您的幫助

推薦答案

好的，好像可以了.如果嘗試下載目錄或掃描文件，可能會(huì)出現(xiàn)問題.異常處理可以方便地捕獲錯(cuò)誤的文件類型并跳過.

Ok, seems to work. There may be issues if trying to download a directory, or scan a file. Exception handling may come handy to trap wrong filetypes and skip.

glob.glob 無法工作，因?yàn)槟谶h(yuǎn)程文件系統(tǒng)上，但您可以使用 fnmatch 來匹配名稱

glob.glob cannot work since you're on a remote filesystem, but you can use fnmatch to match the names

代碼如下:它會(huì)下載TEMP目錄下所有匹配*DEM*的文件，按目錄排序.

Here's the code: it download all files matching *DEM* in TEMP directory, sorting by directory.

import ftplib,sys,fnmatch,os

output_root = os.getenv("TEMP")

fc = ftplib.FTP("ftp.igsb.uiowa.edu")
fc.login()
fc.cwd("/gis_library/counties")

root_dirs = fc.nlst()
for l in root_dirs:
    sys.stderr.write(l + " ...
")
    #print(fc.size(l))
    dir_files = fc.nlst(l)
    local_dir = os.path.join(output_root,l)
    if not os.path.exists(local_dir):
        os.mkdir(local_dir)

    for f in dir_files:
        if fnmatch.fnmatch(f,"*DEM*"):   # cannot use glob.glob
            sys.stderr.write("downloading "+l+"/"+f+" ...
")
            local_filename = os.path.join(local_dir,f)
            with open(local_filename, 'wb') as fh:
                fc.retrbinary('RETR '+ l + "/" + f, fh.write)

fc.close()

這篇關(guān)于使用 Python 從包含給定字符串的 FTP 服務(wù)器下載文件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(wǎng)！