用Qt for python编写一个获取数据并绘制实时动态折线图的程序

好的，以下是一个使用Qt for Python(PySide2)的示例代码，实现获取数据并绘制实时动态折线图：

import sys
import random
import time
from PySide2.QtCore import Qt, QThread, Signal
from PySide2.QtGui import QPainter, QPen, QBrush
from PySide2.QtWidgets import QApplication, QWidget


class DataThread(QThread):
    dataChanged = Signal(float)

    def run(self):
        while True:
            # 模拟数据源，每隔1秒生成一组随机数据
            data = random.randint(0, 100)
            self.dataChanged.emit(data)
            time.sleep(1)


class DynamicLineChart(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle('Dynamic Line Chart')
        self.setGeometry(100, 100, 800, 600)
        self.data = []
        self.dataThread = DataThread()
        self.dataThread.dataChanged.connect(self.addData)
        self.dataThread.start()

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing, True)
        painter.setPen(QPen(Qt.black, 2, Qt.SolidLine))
        painter.setBrush(QBrush(Qt.NoBrush))

        # 绘制坐标轴
        painter.drawLine(50, 550, 750, 550)
        painter.drawLine(50, 550, 50, 50)

        # 绘制折线图
        if len(self.data) > 1:
            painter.setPen(QPen(Qt.red, 2, Qt.SolidLine))
            for i in range(len(self.data) - 1):
                x1 = 50 + i * 10
                y1 = 550 - self.data[i] * 5
                x2 = 50 + (i + 1) * 10
                y2 = 550 - self.data[i + 1] * 5
                painter.drawLine(x1, y1, x2, y2)

    def addData(self, data):
        self.data.append(data)
        if len(self.data) > 70:
            self.data.pop(0)
        self.update()


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

这个示例程序会每隔1秒生成一组随机数据，并实时绘制折线图。你可以将数据源替换为你自己的数据源，然后运行这个程序即可实现实时动态折线图的绘制。