I'm trying to convert python2 to python3，i have an error : use this command "telnet localhost 5005 "to connect the program, but when i try to login, one problem was reported.
ScreenShot: 
Codes:
#!/usr/bin/env python3
__author__ = 'tcstory'
from asyncore import dispatcher
from asynchat import async_chat
import socket, asyncore
PORT=5005
NAME='TestChat'
class EndSession(Exception): pass
class CommandHandler:
'''
Simple command handler similar to cmd.Cmd from the standard library
'''
def unknown(self, session, cmd):
'Respond to an unknown command'
session.push('Unkonw command: {0}
'.format(cmd).encode())
def handle(self, session, line):
'Handle a received line from a given session'
if not line.strip():
return
#Split off the command
parts = line.split(' ', 1)
cmd = parts[0]
try:
line=parts[1].strip()
except IndexError:
line=''
#Try to find a handler
meth=getattr(self,'do_'+cmd,None)
try:
#Assume it's callable
meth(session,line)
except TypeError:
#If it isn't ,respond to the unknown command
self.unknown(session,cmd)
class Room(CommandHandler):
'''
A generic environment that may contain one or more users(sessions).it takes care of basic command handling and broadcasting.
'''
def __init__(self,server):
self.server=server
self.sessions=[]
def add(self,session):
'A session(user) has entered the room'
self.sessions.append(session)
def remove(self,session):
'A session (user) has left the room'
self.sessions.remove(session)
def broadcast(self,line):
'Send a line to all sessions in the room'
for session in self.sessions:
session.push(line.encode())
def do_logout(self,session,line):
'Respond to the logout command'
raise EndSession
class LoginRoom(Room):
'''
A room meant for a single person who has just connected
'''
def add(self,session):
Room.add(self,session)
#When a user enters,greet him/her
self.broadcast('Welcome to {0}
'.format(self.server.name))
def unknown(self, session, cmd):
#All unknown commands (anything except login or logout)
#results in a prodding
session.push('Please log in
Use "login <nick>"
'.encode())
def do_login(self,session,line):
name=line.strip()
#Make sure the user has entered a name
if not name:
session.push('Please enter a name
'.encode())
#Make sure that the name isn't in use
elif name in self.server.users:
session.push('The name {0} is taken.
'.format(name).encode())
session.push('Please try again.
'.encode())
else:
#The name is OK,os it is stored in the session.and
#the user is moved into the main room
session.name=name
session.enter(self.server.main_room)
class ChatRoom(Room):
'''
A room meant for multiple users who can chat with the others in the room
'''
def add(self,session):
#Notify everyone that a new user has entered
self.broadcast('{0} has entered the room.
'.format(session.name))
self.server.users[session.name]=session
Room.add(self,session)
def remove(self,session):
Room.remove(self,session)
#Notify everyone that a user has left
self.broadcast('{0} has left the room.
'.format(session.name))
def do_say(self,session,line):
self.broadcast('{0}: '+line+'
'.format(session.name))
def do_look(self,session,line):
'Handles the look command,used to see who is in a room'
session.push('The following are in this room:
'.encode())
for other in self.sessions:
session.push('{0}
'.format(other.name).encode())
def do_who(self,session,line):
'Handles the who command ,used to see who is logged in'
session.push('The following are logged in:
'.encode())
for name in self.server.users:
session.push('{0}
'.format(name))
class LogoutRoom(Room):
'''
A simple room for a single user.Its sole purpose is to remove the user's name from the server
'''
def add(self,session):
#When a session (user) enters the LogoutRoom it is deleted
try:
del self.server.users[session.name]
except KeyError:
pass
class ChatSession(async_chat):
'''
A single session,which takes care of the communication with a single user
'''
def __init__(self,server,sock):
# async_chat.__init__(self,sock)
super().__init__(sock)
self.server=server
self.set_terminator('
')
self.data=[]
self.name=None
#All sessions begin in a separate LoginRoom
self.enter(LoginRoom(server))
def enter(self,room):
# Remove self from current room and add self to next room....
try:
cur=self.room
except AttributeError:pass
else:
cur.remove(self)
self.room=room
room.add(self)
def collect_incoming_data(self, data):
self.data.append(data)
def found_terminator(self):
line=''.join(self.data)
self.data=[]
try:
self.room.handle(self,line)
except EndSession:
self.handle_close()
def handle_close(self):
async_chat.handle_close(self)
self.enter(LogoutRoom(self.server))
class ChatServer(dispatcher):
'''
A chat server with a single room
'''
def __init__(self,port,name):
super().__init__()
# dispatcher.__init__(self)
self.create_socket(socket.AF_INET,socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind(('',port))
self.listen(5)
self.name=name
self.users={}
self.main_room=ChatRoom(self)
def handle_accept(self):
conn,addr=self.accept()
ChatSession(self,conn)
if __name__=='__main__':
s=ChatServer(PORT,NAME)
try:
asyncore.loop()
except KeyboardInterrupt:
print()
What is the problem that is giving me this error?
traceback
error: uncaptured python exception, closing channel <__main__.ChatSession connected
127.0.0.1:39939 at 0x7f14b1f07d68>
(<class 'TypeError'>:Type str doesn't support the buffer API
[/usr/lib/python3.4/asyncore.py|read|83] [/usr/lib/python3.4/asyncore.py|handle_read_event|442]
[/usr/lib/python3.4/asynchat.py|handle_read|154])
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