Re: [Matplotlib-users] Qt4Agg backend possible bug

Jorge Scandaliaris <jorgesmbox-ml@...> writes:

> 
> Hi,
> I just mentioned this problem with Qt4Agg and python 3.4 in another thread
> [1], but I decided to post it on a thread of its own, as I suspect it might
> be a bug in the Qt4Agg backend.
> 
> I get a NameError exception (see backtrace below) when trying to use key
> events in matplotlib (master branch rev:
> e322d5f5bb024bbec44d3ba76da1bc16bf52af9c), python 3.4.1, and pyqt 4.10.
> Is this a bug?

I can confirm that using chr() instead of unichr() fixes this problem. I
don't know how ones handle python2 vs python3 in these cases

diff --git a/lib/matplotlib/backends/backend_qt4.py
b/lib/matplotlib/backends/backend_qt4.py
index 70152aa..b0d8233 100644
--- a/lib/matplotlib/backends/backend_qt4.py
+++ b/lib/matplotlib/backends/backend_qt4.py
@@ -362,7 +362,7 @@ class FigureCanvasQT(QtGui.QWidget, FigureCanvasBase):
             if event_key > MAX_UNICODE:
                 return None
 
-            key = unichr(event_key)
+            key = chr(event_key)
             # qt delivers capitalized letters.  fix capitalization
             # note that capslock is ignored
             if 'shift' in mods:

jorge