from ftplib import FTP
from os.path import join

filename = 'raytux.jpg'
path = '/pub/ibiblio/logos/penguins'
destination = open(filename, 'wb')
with FTP('ftp.nluug.nl', 'anonymous') as ftp:
    ftp.retrbinary(
        'RETR {}'.format(join(path, filename)),
        destination.write)
destination.close()