求 Python 大佬解救

最近做项目写了一个小 websocket 服务器但是有报错我自己没法搞定求大神解救
报错信息：代码：
import socket
import time
import hashlib
import base64
import struct
import threading
import chardet

connlist = []
s = socket.socket()         
host = "0.0.0.0"
port = 1999                
s.bind((host, port))       
s.listen(500) 

def getheads(data):
    data = data.decode()
    datasplit = data.split("\r\n")
    datasplit = datasplit[1:-2]
    headslist = {}
    for i in datasplit:
        k,v = i.split(":",1)
        headslist[k] = v.replace(' ','')
    return headslist

def _get_data(info, setcode):
    payload_len = info[1] & 127
    fin = 1 if info[0] & 128 == 128 else 0
    opcode = info[0] & 15
    if payload_len == 126:
        mask = info[4:8]
        decoded = info[8:]
    elif payload_len == 127:
        mask = info[10:14]
        decoded = info[14:]
    else:
        mask = info[2:6]
        decoded = info[6:]
    bytes_list = bytearray()
    for i in range(len(decoded)):
        chunk = decoded[i] ^ mask[i % 4]
        bytes_list.append(chunk)
    if opcode == 0x00:
        opcode = setcode
    if opcode == 0x01:
        body = str(bytes_list, encoding='utf-8',errors='ignore')
        return fin, opcode, body
    else:
        body = decoded
        return fin, opcode, body
            
def recv(conn):
    msg = ''
    opcode = 0x00
    while True:
        raw_data = b''
        while True:
            section = conn.recv(1024)
            raw_data += section
            if len(section) < 1024:
                break
        fin, _opcode, fragment = _get_data(raw_data,opcode)
        opcode = _opcode if _opcode != 0x00 else opcode
        msg += fragment
        if fin == 1: 
            break
    return msg
    
def send(conn,msg,fin=True):
    data = struct.pack('B', 129) if fin else struct.pack('B', 0)
    msg_len = len(msg)
    if msg_len <= 125:
        data += struct.pack('B', msg_len)
    elif msg_len <= (2**16 - 1):
        data += struct.pack('!BH', 126, msg_len)
    elif msg_len <= (2**64 - 1):
        data += struct.pack('!BQ', 127, msg_len)
    else:
        while True:
            fragment = msg[:(2**64 - 1)]
            msg -= fragment
            if msg > (2**64 - 1):
                conn.send(fragment, False)
            else:
                conn.send(fragment)
    data += bytes(msg,encoding='utf-8',errors='ignore')
    conn.send(data)


def shakehands(conn):
    data = conn.recv(1024)
    heads = getheads(data)
    msg = heads["Sec-WebSocket-Key"]
    key = msg + '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
    ser_key = hashlib.sha1(key.encode('utf-8')).digest()
    token = base64.b64encode(ser_key)
    message = "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: "+bytes.decode(token)+"\r\nWebSocket-Origin: "+str(heads["Origin"])+"\r\nWebSocket-Location: ws://"+str(heads["Host"])+"\r\n\r\n"
    conn.send(message.encode())
    connlist.append(conn)

def websockethandle(conn,addr):
    shakehands(conn) 
    ip,port = addr
    print(ip+" 连入")
    print("当前用户数:"+str(len(connlist)))
    while True:
        try: 
            data= recv(conn)
        except Exception as e:
            print(e)
            print(ip+" 断开")
            conn.close()
            connlist.remove(conn)
            print("当前用户数:"+str(len(connlist)))
            break
        for i in connlist:
            if i != conn:
                send(i,data)
                    
while True:
    conn,addr = s.accept()
    threading.Thread(target=websockethandle,args=(conn,addr,)).start()