---

import sys
from PyQt5.QtWidgets import QWidget, QApplication

from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt, QPoint, QPointF, QLineF


class LineDrawer(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Соединение  точек")
        self.setGeometry(100, 100, 400, 300)

        self.list_t = [(0.0, 79.4), (1.0, 80.0), (2.0, 79.1), (3.0, 79.5),
                       (4.0, 80.5), (5.0, 80.2), (6.0, 79.3)]

    def paintEvent(self, event):
        # p1 = QPoint(0,79.4)
        # p2 = QPoint(40,80)
        # p3 = QPoint(80,79.1)
        # p4 = QPoint(120, 79.5)
        # p5 = QPoint(160, 80.5)
        # p6 = QPoint(200, 80.2)
        # p7 = QPoint(240, 79.3)

        painter = QPainter(self)
        pen = QPen(Qt.GlobalColor.red, 3)
        painter.setPen(pen)
        # painter.drawLine(p1, p2)
        # painter.drawLine(p2, p3)

        if len(self.list_t) >= 2:
            for i in range(len(self.list_t) - 1):
                x1, y1 = self.list_t[i]
                x2, y2 = self.list_t[i + 1]
                points = QLineF(x1, y1, x2, y2)
                painter.drawLine(points)
                # painter.drawLine(points[i + 1])

app = QApplication(sys.argv)
window = LineDrawer()
window.show()
sys.exit(app.exec())