关于json序列化时报错json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

# ### 客户端
import socket
import hashlib
import json

def register(sk):
    name = input(‘请输入注册用户名‘)
    pwd = input("请输入注册密码")
    pwd2 = input("请再次输入注册密码")
    dic = {‘username‘:name,‘password‘:pwd,‘password2‘:pwd,‘status‘:1}
    sk.send(json.dumps(dic).encode())
    res = sk.recv(1024)
    return res

def login(sk):
    name = input(‘请输入账户‘)
    pwd = input(‘请输入密码‘)
    hs = hashlib.md5()
    hs.update(pwd.encode())
    res = hs.hexdigest()
    dic = {‘username‘: name, ‘password‘: res, ‘password2‘: res, ‘status‘: 2}
    #发送数据
    sk.send(json.dumps(dic).encode())
    res = sk.recv(1024)
    return res
#1.创建对象
sk = socket.socket()

#2.创建连接
sk.connect((‘127.0.0.1‘,9001))

#.接收发数据
num = input(‘请输入注册1,登陆2‘)
if num == ‘1‘:
    res = register(sk)
    print(res.decode())
elif num == ‘2‘:
    res = login(sk)
    print(res.decode())
else:
    print("输入有误请重新输入")

#断开连接
sk.close()

# ### 服务端
import hashlib
import json
import socketserver
import os

class MyServer(socketserver.BaseRequestHandler):
    def handle(self):
        conn = self.request
        while True:
            msg = conn.recv(1024)#接收的是字节流
            strvar = msg.decode() #转换为字符串
            print(strvar)
            json.loads(strvar) #反序列化成字典
            print(json)
            # if not msg:break  #先把这段话去掉
            if json.loads(msg.decode())[‘status‘] == 1:
                with open(‘mysql.json‘,‘r+‘,encoding=‘utf-8‘) as fp:
                    if not os.path.getsize(‘mysql.json‘):
                        hs = hashlib.md5()
                        hs.update(json.loads(msg.decode())[‘password‘].encode())
                        hs_res = hs.hexdigest()
                        dic = {"username": json.loads(msg.decode())[‘username‘], "password": hs_res}
                        json.dump(dic, fp)
                        fp.write(‘\n‘)
                        print(‘注册成功‘)
                        conn.send(‘注册成功‘.encode())
                        break
                    else:
                        for i in fp:
                            dic_res = json.loads(i)
                            if dic_res["username"] == json.loads(msg.decode())[‘username‘]:
                                print(‘用户名已注册‘)
                                conn.send("用户名已注册".encode())
                                break
                            elif json.loads(msg.decode())[‘username‘] not in dic_res["username"]:
                                hs = hashlib.md5()
                                hs.update(json.loads(msg.decode())[‘password‘].encode())
                                hs_res = hs.hexdigest()
                                dic = {"username":json.loads(msg.decode())[‘username‘],"password":hs_res}
                                json.dump(dic,fp)
                                fp.write(‘\n‘)
                                print(‘注册成功‘)
                                conn.send(‘注册成功‘.encode())
                                break
            elif  json.loads(msg.decode())[‘status‘] == 2:
                with open(‘mysql.json‘, ‘r‘, encoding=‘utf-8‘) as fp:
                    for i in fp:
                        dic_res = json.loads(i)
                        if dic_res["username"] == json.loads(msg.decode())[‘username‘] and dic_res["password"] == json.loads(msg.decode())[‘password‘]:
                            print(‘账户密码正确,登录成功‘)
                            conn.send(‘账户密码正确,登录成功‘.encode())
                            break
                        else:
                            print(‘账户或密码错误‘)
                            conn.send(‘账户或密码错误‘.encode())
                            break


server = socketserver.ThreadingTCPServer((‘127.0.0.1‘,9001),MyServer)
server.serve_forever()