title: Show data in the Curve
body: <p>I am a event problem on the pyqt4
  How should I debug the code? I found our some issuse. check the line 5</p>
  <pre><code>import sys
  matplotlib.use(&quot;Qt5Agg&quot;)
  from PyQt4 import QtCore
  
  from matplotlib.backends.backend_qt5agg import Navigation as NavigationToolbar    
         FigureCanvas(self,QSizePolicy.Expanding,QSizePolicy.Expanding                               
  
  class MatplotlibWidget(QWidget):
      def __init__(self, parent=None):
          super(MatplotlibWidget, self).__init__(parent)
          self.initUi()
      def initUi(self):
          self.layout = QVBox(self)
          self.mpl = plut(self, width=100, height=20, dpi=100)
  </code></pre>