Lib/ftplib.py  function retrlines

Inspired by documentation the following writes a file without line-endings:
 
from ftplib import FTP
ftp=FTP()
ftp.connect('hostname')
ftp.login('user','xxxxxxxx')
ftp.sendcmd('pasv')

with open('crap2.txt', 'w') as fp:
    ftp.retrlines('RETR crap.txt', fp.write)

Code goes to pains to slice off the line endings, and then print_line does not add them back? Apologies if this has been covered before, or I am not following the documentation correctly. Not going to suggest a fix as there may be a reason it is like this.

For RETR.
For ascii