python写一个串口助手

以下是一个简单的Python串口助手的实现，它使用了PyQt5库来实现GUI界面和串口通信功能：

import sys
import serial
import serial.tools.list_ports
from PyQt5.QtWidgets import QApplication, QMainWindow, QMessageBox
from PyQt5.QtCore import QTimer
from PyQt5.QtGui import QTextCursor
from ui_mainwindow import Ui_MainWindow

class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.Com_Dict = {}
        self.ser = serial.Serial()
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.receive_data)
        self.pushButton_open.clicked.connect(self.port_open)
        self.pushButton_close.clicked.connect(self.port_close)
        self.pushButton_send.clicked.connect(self.send_data)
        self.pushButton_clear.clicked.connect(self.textBrowser_receive.clear)
        self.port_check()

    def port_check(self):
        # 检测所有存在的串口，将信息存储在字典中
        port_list = list(serial.tools.list_ports.comports())
        self.comboBox_port.clear()
        for port in port_list:
            self.Com_Dict["%s" % port[0]] = "%s" % port[1]
            self.comboBox_port.addItem(port[0])
        # 无串口判断
        if len(self.Com_Dict) == 0:
            self.comboBox_port.addItem("无串口")

    def port_open(self):
        # 打开串口
        self.ser.port = self.comboBox_port.currentText()
        self.ser.baudrate = int(self.comboBox_baudrate.currentText())
        self.ser.bytesize = int(self.comboBox_databit.currentText())
        self.ser.stopbits = int(self.comboBox_stopbit.currentText())
        self.ser.parity = self.comboBox_parity.currentText()
        try:
            self.ser.open()
        except Exception as e:
            QMessageBox.warning(self, "警告", str(e))
            return None
        if self.ser.isOpen():
            self.pushButton_open.setEnabled(False)
            self.pushButton_close.setEnabled(True)
            self.comboBox_port.setEnabled(False)
            self.comboBox_baudrate.setEnabled(False)
            self.comboBox_databit.setEnabled(False)
            self.comboBox_stopbit.setEnabled(False)
            self.comboBox_parity.setEnabled(False)
            self.timer.start(100)

    def port_close(self):
        # 关闭串口
        self.timer.stop()
        self.ser.close()
        self.pushButton_open.setEnabled(True)
        self.pushButton_close.setEnabled(False)
        self.comboBox_port.setEnabled(True)
        self.comboBox_baudrate.setEnabled(True)
        self.comboBox_databit.setEnabled(True)
        self.comboBox_stopbit.setEnabled(True)
        self.comboBox_parity.setEnabled(True)

    def send_data(self):
        # 发送数据
        if self.ser.isOpen():
            send_data = (self.textEdit_send.toPlainText() + '\n').encode()
            self.ser.write(send_data)

    def receive_data(self):
        # 接收数据
        try:
            num = self.ser.inWaiting()
        except Exception as e:
            self.timer.stop()
            QMessageBox.warning(self, "警告", str(e))
            return None
        if num > 0:
            data = self.ser.read(num)
            self.textBrowser_receive.insertPlainText(data.decode())
            self.textBrowser_receive.moveCursor(QTextCursor.End)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.show()
    sys.exit(app.exec_())