Python Serial

from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton,  QPlainTextEdit,QMessageBox
import serial
from time import sleep
class Stats:
    def __init__(self):
        self.window = QMainWindow()
        self.window.resize(300, 200)
        self.window.move(500, 200)
        self.window.setWindowTitle('磁力计标定')

        # self.textEdit = QPlainTextEdit(self.window)
        # self.textEdit.setPlaceholderText("请输入薪资表")
        # self.textEdit.move(10, 25)
        # self.textEdit.resize(300, 350)

        self.button = QPushButton('开始标定', self.window)
        self.button.move(100, 50)

        self.button.clicked.connect(self.handleCalc)

    def handleCalc(self):
        send(str(55));
def recv(serial):
    while True:
        data = serial.read_all().hex()
        if data == '':
            continue
        else:
            break
        sleep(0.02)
    return data

def send(send_data):
    send_data_hex = bytes.fromhex(send_data)
    if (serial.isOpen()):
        serial.write(send_data_hex)  # 编码
        print("发送成功", send_data_hex)
    else:
        print("发送失败！")

if __name__ == '__main__':
    serial = serial.Serial('COM3', 9600, timeout=0.5)
    if serial.isOpen() :
        print("open success")
    else :
        print("open failed")
    app = QApplication()
    stats = Stats()
    stats.window.show()
    app.exec()