python - List files with pyftp - proftpd vs. pyftpdlib behavior -

i have test code uses ftp stub pyftpdlib, surprise failed in production. reason proftpd returns directory name in response nlst. here response pyftpdlib ftp stub:

in [10]: local_conn.login('user', '12345') out[10]: '230 login successful.'  in [11]: import ftplib  in [12]: local_conn = ftplib.ftp()  in [13]: local_conn.connect('localhost', 2121) out[13]: '220 pyftpdlib 1.4.0 ready.'  in [14]: local_conn.login('user', '12345') out[14]: '230 login successful.'  in [15]: local_conn.nlst('structuredata_advanced') out[15]:  ['report_20150618.csv',  'report_20150618.fin',  'report_20150619.csv',  'report_20150619.fin',  'report_20150620.csv',  'report_20150620.fin'] 

here response proftpd:

in [16]: remote_conn = ftplib.ftp()  in [17]: remote_conn.connect('a1b.7y.xx.xx', 21) out[17]: '220 proftpd 1.3.4a server (vztd3.company.com) [a1b.7y.xx.xx]'  in [18]: remote_conn.login('remoteuser', 'verysecret') out[18]: '230 user yougov logged in'  in [19]: remote_conn.nlst('structuredata_advanced') out[19]:  ['structuredata_advanced/report_20150624.csv',  'structuredata_advanced/report_20150629.csv',  'structuredata_advanced/report_20150625.fin',  'structuredata_advanced/report_20150628.fin',  'structuredata_advanced/report_20150627.fin',  'structuredata_advanced/report_20150620.fin',  'structuredata_advanced/report_20150619.csv',    ...] 

it's easy enough remove directory names:

    # code works both in production , testing      files = conn.nlst(basedir)     # proftd weired returns basedir name     files = [f.split('/')[-1] f in files] 

but understand if pyftpdlib wrong?
can configured in proftpd?
there need know ftp protocol , nlst command?

update

i tested ftp server called uftpd behaves pyftpdlib when issuing nlst.

i'm author of uftpd.

i googled bit, turns out djb wrote aboute this while back, , unfortunately seems output differs between servers.

my interpretation though is; recommended not prefix each output file in given directory directory name. i.e., if client sends 'nlst dir' server should not reply:

dir/a dir/b 

but instead output files in directory dir/ this:

a b