plot.py

#!/usr/bin/env python

import random
import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

from PyQt5.QtCore import (QLineF, QPointF, QRectF, Qt, QTimer)
from PyQt5.QtGui import (QBrush, QColor, QPainter)
from PyQt5.QtWidgets import (QApplication, QGraphicsView, QGraphicsScene, QGraphicsItem,
                             QGridLayout, QVBoxLayout, QHBoxLayout, QSizePolicy,
                             QLabel, QLineEdit, QPushButton)

# FigureCanvas inherits QWidget
class MainWindow(FigureCanvas):
    def __init__(self, parent=None, width=4, height=3, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        self.axes.hold(False)

        super(MainWindow, self).__init__(fig)
        self.setParent(parent)

        FigureCanvas.setSizePolicy(self,
                                   QSizePolicy.Expanding,
                                   QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

        timer = QTimer(self)
        timer.timeout.connect(self.update_figure)
        timer.start(50)

        self.x  = np.arange(0, 4*np.pi, 0.1)
        self.y  = np.sin(self.x)

        self.setWindowTitle("Sin Curve")

    def update_figure(self):
        self.axes.plot(self.x, self.y)
        self.y = np.roll(self.y,-1)
        self.draw()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    mainWindow = MainWindow()

    mainWindow.show()
    sys.exit(app.exec_())