host = 'ftp.avm.de'
user = 'anonymous'
passwd = ''


import ftputil
with ftputil.FTPHost(host, user, passwd) as ftp:
    print(ftp.listdir('.'))


import ftplib
with ftplib.FTP(host, user, passwd) as ftp:
    print(ftp.nlst('.'))

['archive', 'fritzbox', 'fritzpowerline', 'fritzwlan']
['archive', 'fritzbox', 'fritzpowerline', 'fritzwlan']

[]
['1', '2', '3']