[gtk-vnc] gvncviewer.py: fix python3 errors

[Daniel P. Berrange <dberrange src gnome org>]

commit 33292f717f1b119c9a0f8d88f947623caf030549
Author: Dr. Matthias St. Pierre <matthias st pierre ncp-e com>
Date:   Thu Oct 22 16:49:11 2020 +0200

    gvncviewer.py: fix python3 errors
    
    The only change necessary was to convert the print statements
    to functions and add a __future__ for python2 compatibility.

 examples/gvncviewer.py | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)
---
diff --git a/examples/gvncviewer.py b/examples/gvncviewer.py
index 091c1f1..bd3aeb2 100755
--- a/examples/gvncviewer.py
+++ b/examples/gvncviewer.py
@@ -18,6 +18,8 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 
+from __future__ import print_function
+
 import gi
 gi.require_version('Gtk', '3.0')
 gi.require_version('GtkVnc', '2.0')
@@ -27,7 +29,7 @@ from gi.repository import GtkVnc
 import sys
 
 if len(sys.argv) != 2 and len(sys.argv) != 3:
-    print "syntax: gvncviewer.py host:display [password]"
+    print("syntax: gvncviewer.py host:display [password]")
     sys.exit(1)
 
 def set_title(vnc, window, grabbed):
@@ -51,7 +53,7 @@ def vnc_screenshot(src, ev, vnc):
     if ev.keyval == Gdk.keyval_from_name("F11"):
         pix = vnc.get_pixbuf()
         pix.save("gvncviewer.png", "png", { "tEXt::Generator App": "gvncviewer.py" })
-        print "Screenshot saved to gvncviewer.png"
+        print("Screenshot saved to gvncviewer.png")
 
     return False
 
@@ -62,38 +64,38 @@ def vnc_ungrab(src, window):
     set_title(src, window, False)
 
 def vnc_connected(src):
-    print "Connected to server"
+    print("Connected to server")
 
 def vnc_initialized(src, window):
-    print "Connection initialized"
+    print("Connection initialized")
     set_title(src, window, False)
     window.show_all()
 
 def vnc_disconnected(src):
-    print "Disconnected from server"
+    print("Disconnected from server")
     Gtk.main_quit()
 
 def send_caf1(src, vnc):
-    print "Send Ctrl+Alt+F1"
+    print("Send Ctrl+Alt+F1")
     vnc.send_keys(["Control_L", "Alt_L", "F1"])
 
 def send_caf7(src, vnc):
-    print "Send Ctrl+Alt+F7"
+    print("Send Ctrl+Alt+F7")
     vnc.send_keys(["Control_L", "Alt_L", "F7"])
 
 def send_cad(src, vnc):
-    print "Send Ctrl+Alt+Del"
+    print("Send Ctrl+Alt+Del")
     vnc.send_keys(["Control_L", "Alt_L", "Del"])
 
 def send_cab(src, vnc):
-    print "Send Ctrl+Alt+BackSpace"
+    print("Send Ctrl+Alt+BackSpace")
     vnc.send_keys(["Control_L", "Alt_L", "BackSpace"])
 
 def vnc_auth_cred(src, credList):
     prompt = 0
     data = []
 
-    print type(credList)
+    print(type(credList))
     for i in range(credList.n_values):
         data.append(None)
         if credList.get_nth(i) in (GtkVnc.DisplayCredential.USERNAME, GtkVnc.DisplayCredential.PASSWORD):
@@ -145,10 +147,10 @@ def vnc_auth_cred(src, credList):
     for i in range(credList.n_values):
         if i < len(data) and data[i] != None:
             if src.set_credential(credList.get_nth(i), data[i]):
-                print "Cannot set credential type %d" % (credList.get_nth(i))
+                print("Cannot set credential type %d" % (credList.get_nth(i)))
                 src.close()
         else:
-            print "Unsupported credential type %d" % (credList.get_nth(i))
+            print("Unsupported credential type %d" % (credList.get_nth(i)))
             src.close()
 
 window = Gtk.Window()
@@ -203,7 +205,7 @@ if disp != -1:
 else:
     host = sys.argv[1]
     port = "5900"
-print "Connecting to %s %s" % (host, port)
+print("Connecting to %s %s" % (host, port))
 
 vnc.open_host(host, port)
 vnc.connect("vnc-pointer-grab", vnc_grab, window)