call isatty() on the file handle

src/python/sso/urllib2_handler.py

 
 import cookielib
 import getpass
-import os
 import urllib2
 import urllib
 import re
@@ -44,7 +43,7 @@ class SSOProcessor(urllib2.BaseHandler):
                 if self._otp_pattern.search(response_data):
                     # Only ask for an OTP when the standard input is a tty,
                     # otherwise simply don't send any OTP.
-                    if os.isatty(sys.stdin):
+                    if sys.stdin.isatty():
                         form_data['otp'] = raw_input('OTP for %s@%s: ' % (
                             self._username, form_data['s'].rstrip('/')))
                 newreq = urllib2.Request(request_baseurl,