requests library doesn't support ftp links.
To download a file from FTP server you could:
import urllib
urllib.urlretrieve('ftp://server/path/to/file', 'file')
# if you need to pass credentials:
# urllib.urlretrieve('ftp://username:password@server/path/to/file', 'file')
Or:
import shutil
import urllib2
from contextlib import closing
with closing(urllib2.urlopen('ftp://server/path/to/file')) as r:
with open('file', 'wb') as f:
shutil.copyfileobj(r, f)
Python3:
import shutil
import urllib.request as request
from contextlib import closing
with closing(request.urlopen('ftp://server/path/to/file')) as r:
with open('file', 'wb') as f:
shutil.copyfileobj(r, f)