客户端：

from socket import *
client = socket()
client.connect(('192.168.124.18',9999))
while True:
    print('==========')
    print('1.选择文字')
    print('2.选择图片')
    print('3.退出    ')
    print('==========')
    a = input('选择功能：')
    if a =='1':
        client.send(a.encode(encoding='utf8'))
        re_data1 = client.recv(1024)
        print(re_data1.decode(encoding='utf8'))
        # continue
    elif a == '2':
        print('2')
        client.send(a.encode(encoding='utf8'))
        print('send')
        re_data2 = client.recv(1024)
        print(re_data2.decode(encoding='utf8'))
        b = input('选择图片：')
        client.send(b.encode(encoding='utf8'))
        name = input('输入图片名字：')
        while True:
            re_data3 = client.recv(1024)
            print(re_data3)
            with open(name, 'ab') as f:
                f.write(re_data3)
            if len(re_data3) < 1024:
                print('完事')
                break
    elif a == '3':
        client.send(a.encode(encoding='utf8'))
        print('GG')
        break

服务器：

from socket import *
import os

server = socket()
server.bind(('192.168.124.18', 9999))
server.listen(512)
connect, addr = server.accept()
while True:
    print('开始')
    # connect, addr = server.accept()
    # 接受消息
    # while True:
    result = connect.recv(1024)
    value = result.decode(encoding='utf8')
    print(value)
    if value == '1':
        print('回来了')
        # 发送消息
        a = input('输入消息：')
        connect.send(a.encode(encoding='utf8'))
    elif value == '2':
        print('2')
        str1 = str(os.listdir('image'))
        connect.send(str1.encode(encoding='utf8'))
        # connect1, addr1 = server.accept()
        result1 = connect.recv(1024)
        img = result1.decode(encoding='utf8')
        print(img)
        flag =True
        if img not in os.listdir('image'):
            print('傻**')
            connect.send('傻**')
            flag= False
        if flag:
            print('开始传输')
            with open(img, 'rb') as f:
                connect.send(f.read())
                # if len(f.read())<1024:
                #     break
    elif value =='3':
        print('GG')
        break