如何从FTP服务器的所有子目录下载特定文件类型？

Question

I am trying to download all .laz files from the FTP host gis.arkansas.gov (more details here ). Looking at the ftplib documentation, I see that I can list all of the directories in the FTP server:

from ftplib import FTP
ftp = FTP('gis.arkansas.gov')
ftp.login()
ftp.cwd('Elevation')
ftp.retrlines('LIST')

---

Which yields the following:

>>> ftp.retrlines('LIST')
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 AGFC_RAW
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 AR State Parks
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 Bayou Meto Lidar Phase I
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 Bayou_Meto_Watershed
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 Beaver_Lake
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 Beaver_Tailwater
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 Black_River
drwxr-xr-x 1 ftp ftp              0 May 30 09:24 Blue_Mountain
# ... And so on ...

How can I download all of the files with a .laz extension from each of these directories (some directories do not contain .laz files)?

Answer 1

There's no magic.

You have to:

• recurse into the subdirectories,
• list their contents one by one,
• filter all .laz files,
• call retrbinary for each.