from ftplib import FTP
ftp = FTP()
HOST = '192.168.1.59'
PORT = 3121
USER = 'simple'
PASS = 'qwerty'
ftp.connect(HOST, PORT)
ftp.login(USER, PASS)
print('Connected')
out = '/home/pi/UM10211.pdf'
with open(out, 'wb') as f:
    ftp.retrbinary('RETR ' + 'UM10211.pdf', f.write)