code: import sys
  import time
  
  import numpy as np
  
  from matplotlib.backends.qt_compat import QtCore, QtWidgets, is_pyqt5
  if is_pyqt5():
      from matplotlib.backends.backend_qt5agg import (
          FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
  else:
      from matplotlib.backends.backend_qt4agg import (
          FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
  from matplotlib.figure import Figure
  
  
  class ApplicationWindow(QtWidgets.QMainWindow):
      def __init__(self):
          super().__init__()
          self._main = QtWidgets.QWidget()
          self.setCentralWidget(self._main)
          layout = QtWidgets.QVBoxLayout(self._main)
  
          static_canvas = FigureCanvas(Figure(figsize=(5, 3)))
          layout.addWidget(static_canvas)
          self.addToolBar(NavigationToolbar(static_canvas, self))
  
          dynamic_canvas = FigureCanvas(Figure(figsize=(5, 3)))
          layout.addWidget(dynamic_canvas)
          self.addToolBar(QtCore.Qt.BottomToolBarArea,
                          NavigationToolbar(dynamic_canvas, self))
  
          self._static_ax = static_canvas.figure.subplots()
          t = np.linspace(0, 10, 501)
          self._static_ax.plot(t, np.tan(t), ".")
  
          self._dynamic_ax = dynamic_canvas.figure.subplots()
          self._timer = dynamic_canvas.new_timer(
              100, [(self._update_canvas, (), {})])
          self._timer.start()
  
      def _update_canvas(self):
          self._dynamic_ax.clear()
          t = np.linspace(0, 10, 101)
          # Shift the sinusoid as a function of time.
          self._dynamic_ax.plot(t, np.sin(t + time.time()))
          self._dynamic_ax.figure.canvas.draw()
  
  
  if __name__ == "__main__":
      qapp = QtWidgets.QApplication(sys.argv)
      app = ApplicationWindow()
      app.show()
      qapp.exec_()
apis: matplotlib.backends.backend_qt4agg.NavigationToolbar2QT matplotlib.backends.qt_compat.QtWidgets.QVBoxLayout matplotlib.backends.qt_compat.QtWidgets.QWidget matplotlib.figure.Figure numpy.tan matplotlib.backends.qt_compat.is_pyqt5 matplotlib.backends.qt_compat.QtWidgets.QApplication numpy.linspace