unable to take ftp directory files in list using python

Question

1. If i execute below code , i am getting error .

2. Basically i want to store the contents in a text file , so i am trying to get it in list and write this list in text file . Could anyone help me with this ?

3. Directory files are printed but unable to store that in list import ftplib

   server = ftplib.FTP()

   server.connect('host',postnum)

   server.login('','')

   print("Inside....")

   list1=[]

   #list1=server.dir()

   #print(list1)

   stdout = server.dir()

   lines = str(stdout.readlines()).split("\n")

   print(lines)