Actually! we can just use the py3compat module

Re #716

paramiko/transport.py

@@ -55,7 +55,7 @@
 from paramiko.message import Message
 from paramiko.packet import Packetizer, NeedRekeyException
 from paramiko.primes import ModulusPack
-from paramiko.py3compat import string_types, long, byte_ord, b
+from paramiko.py3compat import string_types, long, byte_ord, b, input
 from paramiko.rsakey import RSAKey
 from paramiko.ecdsakey import ECDSAKey
 from paramiko.server import ServerInterface
@@ -1395,10 +1395,7 @@ def handler(title, instructions, prompt_list):
                     print(instructions.strip())
                 for prompt,show_input in prompt_list:
                     print(prompt.strip(),end=' ')
-                    if (sys.version_info > (3, 0)):
-                        answers.append(input())
-                    else:
-                        answers.append(raw_input())
+                    answers.append(input())
                 return answers
         return self.auth_interactive(username, handler, submethods)