Re: [Matplotlib-users] Qt4Agg backend possible bug

[Werner <wer...@gm...>]

On 6/5/2014 15:10, Jorge Scandaliaris wrote:
> 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:
You would use 'six' - https://pypi.python.org/pypi/six it is used by 
many packages including wxPython.

import six

if six.PY3:
	key = chr(event_key)

else:
	key = unichr(event_key)


Werner