使用QSplitter将界面分为左右两个部分，左边使用QVBoxLayout布局，右边使用QStackedLayout布局。在左边的布局中添加四个QPushButton按钮，分别对应“首页”、“门铃”、“语言留言”和“语音信箱”。 对于“首页”按钮，你可以添加一个QLabel控件用于显示当前时间和天气预报。 对于“门铃”按钮，你可以使用OpenCV库进行人脸检测，如果检测到危险人物可以播放报警声，否则可以播放门铃音乐。可以使用QMediaPlayer控件进行音乐播放。 对于“语言留言”按钮，你可以添加两个QPushButton按钮，分别对应开始录音和结束录音。可以使用PyAudio库进行录音，录音完成后可以弹出一个提示框，提示留言成功。 对于“语音信箱”按钮，你可以添加一个QLineEdit控件用于填写用户名和密码，以及一个QPushButton按钮用于登录。登录成功后可以使用QListWidget控件显示语音列表，在列表中点击一条语音即可播放。编写pyqt5代码

以下是一个简单的实现，其中涉及到的音乐文件和报警声需要自行添加。请注意，这个程序只是一个示例，实际情况需要根据自己的需要进行修改。

import cv2
import pyaudio
import wave
import requests
from PyQt5.QtCore import Qt, QThread, pyqtSignal
from PyQt5.QtGui import QPixmap, QImage
from PyQt5.QtWidgets import QApplication, QWidget, QHBoxLayout, QVBoxLayout, QPushButton, QLabel, QStackedLayout, QSplitter, \
    QLineEdit, QListWidget, QListWidgetItem, QMessageBox
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent


class FaceDetector(QThread):
    detected = pyqtSignal(bool)

    def run(self):
        face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
        cap = cv2.VideoCapture(0)
        while True:
            ret, frame = cap.read()
            if not ret:
                break
            gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
            faces = face_cascade.detectMultiScale(gray, 1.3, 5)
            if len(faces) > 0:
                self.detected.emit(True)
                break
        cap.release()


class RecordThread(QThread):
    finished = pyqtSignal()

    def __init__(self, file_name, parent=None):
        super().__init__(parent)
        self.file_name = file_name

    def run(self):
        CHUNK = 1024
        FORMAT = pyaudio.paInt16
        CHANNELS = 1
        RATE = 44100
        RECORD_SECONDS = 5
        p = pyaudio.PyAudio()
        stream = p.open(format=FORMAT,
                        channels=CHANNELS,
                        rate=RATE,
                        input=True,
                        frames_per_buffer=CHUNK)
        frames = []
        for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
            data = stream.read(CHUNK)
            frames.append(data)
        stream.stop_stream()
        stream.close()
        p.terminate()
        wf = wave.open(self.file_name, 'wb')
        wf.setnchannels(CHANNELS)
        wf.setsampwidth(p.get_sample_size(FORMAT))
        wf.setframerate(RATE)
        wf.writeframes(b''.join(frames))
        wf.close()
        self.finished.emit()


class ChitGPT(QWidget):
    def __init__(self):
        super().__init__()

        self.left_widget = QWidget()
        self.right_widget = QWidget()

        self.init_left_widget()
        self.init_right_widget()

        splitter = QSplitter(Qt.Horizontal)
        splitter.addWidget(self.left_widget)
        splitter.addWidget(self.right_widget)

        layout = QHBoxLayout(self)
        layout.addWidget(splitter)

    def init_left_widget(self):
        layout = QVBoxLayout(self.left_widget)
        self.label = QLabel(self.left_widget)
        layout.addWidget(self.label)

        btn_home = QPushButton('首页', self.left_widget)
        layout.addWidget(btn_home)

        btn_doorbell = QPushButton('门铃', self.left_widget)
        layout.addWidget(btn_doorbell)

        btn_message = QPushButton('语言留言', self.left_widget)
        layout.addWidget(btn_message)

        btn_voice = QPushButton('语音信箱', self.left_widget)
        layout.addWidget(btn_voice)

        btn_home.clicked.connect(self.show_weather)
        btn_doorbell.clicked.connect(self.check_face)
        btn_message.clicked.connect(self.record_message)
        btn_voice.clicked.connect(self.show_voice_list)

    def init_right_widget(self):
        layout = QStackedLayout(self.right_widget)

        login_widget = QWidget(self.right_widget)
        login_layout = QVBoxLayout(login_widget)
        self.username_edit = QLineEdit(login_widget)
        login_layout.addWidget(self.username_edit)
        self.password_edit = QLineEdit(login_widget)
        self.password_edit.setEchoMode(QLineEdit.Password)
        login_layout.addWidget(self.password_edit)
        btn_login = QPushButton('登录', login_widget)
        login_layout.addWidget(btn_login)
        btn_login.clicked.connect(self.login)

        voice_list_widget = QListWidget(self.right_widget)
        voice_list_widget.itemClicked.connect(self.play_voice)

        layout.addWidget(login_widget)
        layout.addWidget(voice_list_widget)

    def show_weather(self):
        r = requests.get('http://wthrcdn.etouch.cn/weather_mini?city=北京')
        weather_data = r.json().get('data')
        if weather_data:
            temperature = weather_data.get('wendu')
            weather = weather_data.get('ganmao')
            self.label.setText(f'温度：{temperature}℃，{weather}')
        else:
            self.label.setText('获取天气信息失败')

    def check_face(self):
        detector = FaceDetector(self)
        detector.detected.connect(self.play_music)
        detector.start()

    def play_music(self, detected):
        if detected:
            player = QMediaPlayer(self)
            player.setMedia(QMediaContent(QUrl.fromLocalFile('alarm.mp3')))
            player.play()
        else:
            player = QMediaPlayer(self)
            player.setMedia(QMediaContent(QUrl.fromLocalFile('doorbell.mp3')))
            player.play()

    def record_message(self):
        file_name = 'message.wav'
        thread = RecordThread(file_name, self)
        thread.finished.connect(lambda: QMessageBox.information(self, '提示', '留言成功'))
        thread.start()

    def show_voice_list(self):
        self.right_widget.layout().setCurrentIndex(1)
        voice_list_widget = self.right_widget.layout().currentWidget()
        voice_list_widget.clear()
        # TODO: 显示语音列表

    def login(self):
        # TODO: 登录验证
        self.right_widget.layout().setCurrentIndex(1)

    def play_voice(self, item: QListWidgetItem):
        # TODO: 播放语音
        pass


if __name__ == '__main__':
    app = QApplication([])
    chit = ChitGPT()
    chit.show()
    app.exec_()