graf_widget.py

import os
os.environ['QT_API'] = 'pyside'

from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg, \
    NavigationToolbar2QTAgg


class Plot_Area(FigureCanvasQTAgg):
    def __init__(self, parent=None):
        super(Plot_Area, self).__init__(Figure())
        self.setParent(parent)
        self.axes = self.figure.add_subplot(111)
        self.axes.hold(False)
        self.toolbar = NavigationToolbar2QTAgg(self, self)

    def plot_line(self, *args):
        self.axes.plot(*args)
        self.axes.axhline(color='k')
        self.axes.grid(True)
        self.draw()

if __name__ == '__main__':
    from PySide.QtGui import QApplication

    app = QApplication([])
    graf = Plot_Area()
    graf.plot_line([-1, 1, 2, 3, 4])
    graf.show()
    app.exec_()