Merge pull request matplotlib#976 from cgohlke/patch-12

Fix embedding_in_qt4_wtoolbar.py on Python 3

examples/user_interfaces/embedding_in_qt4_wtoolbar.py

@@ -1,13 +1,16 @@
+from __future__ import print_function
+
 import sys
+
 import numpy as np
 from matplotlib.figure import Figure
-from matplotlib.backend_bases import FigureManagerBase, key_press_handler
+from matplotlib.backend_bases import key_press_handler
+from matplotlib.backends.backend_qt4agg import (
+    FigureCanvasQTAgg as FigureCanvas,
+    NavigationToolbar2QTAgg as NavigationToolbar)
 from PyQt4.QtCore import *
 from PyQt4.QtGui import *
 
-from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
-from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as NavigationToolbar
-
 
 class AppForm(QMainWindow):
     def __init__(self, parent=None):
@@ -23,21 +26,21 @@ def create_main_frame(self):
         self.fig = Figure((5.0, 4.0), dpi=100)
         self.canvas = FigureCanvas(self.fig)
         self.canvas.setParent(self.main_frame)
-        self.canvas.setFocusPolicy( Qt.StrongFocus )
+        self.canvas.setFocusPolicy(Qt.StrongFocus)
         self.canvas.setFocus()
 
         self.mpl_toolbar = NavigationToolbar(self.canvas, self.main_frame)
 
         self.canvas.mpl_connect('key_press_event', self.on_key_press)
 
         vbox = QVBoxLayout()
-        vbox.addWidget(self.canvas)         # the matplotlib canvas
+        vbox.addWidget(self.canvas)  # the matplotlib canvas
         vbox.addWidget(self.mpl_toolbar)
         self.main_frame.setLayout(vbox)
         self.setCentralWidget(self.main_frame)
 
     def get_data2(self):
-        return np.arange(20).reshape([4,5]).copy()
+        return np.arange(20).reshape([4, 5]).copy()
 
     def on_draw(self):
         self.fig.clear()
@@ -48,11 +51,12 @@ def on_draw(self):
         self.canvas.draw()
 
     def on_key_press(self, event):
-        print 'you pressed', event.key
+        print('you pressed', event.key)
         # implement the default mpl key press events described at
         # http://matplotlib.sourceforge.net/users/navigation_toolbar.html#navigation-keyboard-shortcuts
         key_press_handler(event, self.canvas, self.mpl_toolbar)
 
+
 def main():
     app = QApplication(sys.argv)
     form = AppForm()