How to get file name on a remote server with ftplib?

[alex]

Hello,

My script is trying to get a file from a remote server, every day it
ftps from a directory. My code works perfect if I know the name of the
file in the remote directory.

ftp.retrbinary('RETR ' + filename, handleDownload)

The problem is that in the future the name of the file is going to be
aleatory. How can I get the file's name (only one file is in that
directory) and store it in a variable before executing ftp.retrbinary?

Thanks a lot for your help,

Alex