matplotlib-users Mailing List for matplotlib

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?
> 
A trivial fix using six (credits to Werner for suggesting it), also
submitted as issue #3117 in the GH tracker:
diff --git a/lib/matplotlib/backends/backend_qt4.py
b/lib/matplotlib/backends/backend_qt4.py
index 70152aa..26486b4 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 = six.unichr(event_key)
 # qt delivers capitalized letters. fix capitalization
 # note that capslock is ignored
 if 'shift' in mods:

On 6/5/2014 15:45, "V. Armando Solé" wrote:
...
>> 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)
>>
> Just for info.
>
> I had never heard about six. Is there anything wrong using sys???:
>
> import sys
> if sys.version < "3.0":
> key = unichr(event_key)
> else:
> key = chr(event_key)
>
> Thanks,
Using 'six' for just the above case is definitely overkill, but it has 
many more goodies in it to make py2/py3 single source code easier.
Werner

On 05/06/2014 15:24, Werner wrote:
> 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)
>
Just for info.
I had never heard about six. Is there anything wrong using sys???:
import sys
if sys.version < "3.0":
 key = unichr(event_key)
else:
 key = chr(event_key)
Thanks,
Armando

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

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

Werner <wernerfbd@...> writes:
<...>
> Some time ago I did a bit of work on the wx backend to work with 
> wxPython Phoenix.
> 
> https://github.com/matplotlib/matplotlib/pull/2803
> 
> I haven't had time to look at the last few comments made on that PR.
> 
> Just the other day someone contacted me off list and he used it on a 
> project of his with a recent build of Phoenix. He noted small refresh 
> issues which corrected itself by resizing the frame, this probably needs 
> a "self.Refresh" or similar when things get drawn.
> 
> Builds for Phoenix are here:
> http://wxpython.org/Phoenix/snapshot-builds/
> 
> Recent versions of Phoenix (this is still in development) run on Py 2.7, 
> Py 3.3 and Py 3.4 and use the wheel format and can be installed with the 
> following at least on Windows and Mac as far as I know:
> 
> pip install -U --pre -f http://wxpython.org/Phoenix/snapshot-builds/ 
> wxPython_Phoenix
> 
> Werner
> 
> 
Thanks for the info, but at this point I'd rather focus on the task I need
to solve rather than in the necessary tools. I have just creted a new thread
regarding the Qt4Agg backend problem I saw, as that is probably the closest
path to have a working setup. If that can't be solved, I have to probably go
back to python 2. I upgraded in the first place because it seemed like all
the tools were ready, and that's a natural path, but I can live with python
2 for a bit longer...
Jorge

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?
Regards,
Jorge
backtrace:
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/home/jscandal/sw/matplotlib/matplotlib/lib/matplotlib/backends/backend_qt4.py
in
keyReleaseEvent(self=<matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg
object>, event=<PyQt4.QtGui.QKeyEvent object>)
 308 
 309 def keyReleaseEvent(self, event):
--> 310 key = self._get_key(event)
 key = undefined
 self._get_key = <bound method FigureCanvasQTAgg._get_key of
<matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg object at 0x7f0393412948>>
 event = <PyQt4.QtGui.QKeyEvent object at 0x7f0393507a68>
 311 if key is None:
 312 return
/home/jscandal/sw/matplotlib/matplotlib/lib/matplotlib/backends/backend_qt4.py
in _get_key(self=<matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg
object>, event=<PyQt4.QtGui.QKeyEvent object>)
 363 return None
 364 
--> 365 key = unichr(event_key)
 key = undefined
 global unichr = undefined
 global event_key = undefined
 366 # qt delivers capitalized letters. fix capitalization
 367 # note that capslock is ignored
NameError: name 'unichr' is not defined
[1] http://thread.gmane.org/gmane.comp.python.matplotlib.general/34361

Hi Jorge,
Oops, sorry for first sending it directly to your mail.
Some time ago I did a bit of work on the wx backend to work with 
wxPython Phoenix.
https://github.com/matplotlib/matplotlib/pull/2803
I haven't had time to look at the last few comments made on that PR.
Just the other day someone contacted me off list and he used it on a 
project of his with a recent build of Phoenix. He noted small refresh 
issues which corrected itself by resizing the frame, this probably needs 
a "self.Refresh" or similar when things get drawn.
Builds for Phoenix are here:
http://wxpython.org/Phoenix/snapshot-builds/
Recent versions of Phoenix (this is still in development) run on Py 2.7, 
Py 3.3 and Py 3.4 and use the wheel format and can be installed with the 
following at least on Windows and Mac as far as I know:
pip install -U --pre -f http://wxpython.org/Phoenix/snapshot-builds/ 
wxPython_Phoenix
Werner

On 05/06/2014 07:21, Jorge Scandaliaris wrote:
> Hi,
> After a while away from matplotlib I am back working on some old code. I
> decided to switch to python 3 (bad idea?) and I am having problems with
> backends. I used to use GTKAgg, it worked ok, but it doesn't seem to work
> with python 3?
> 1- What are my choices running python 3 and matplotlib from source (I
> started following the master branch to avoid some bugs in the past, and kept
> using it since)? I did look in the docs and searched the lists, but I
> couldn't find a clear answer.
> 2- Is it discouraged to use matplotlib with python 3?
I am using matplotlib with Python 3 and the Qt backend (PyQt4 and 
PySide) but I did not try to handle key events (just mouse) ...
Armando

Hi,
After a while away from matplotlib I am back working on some old code. I
decided to switch to python 3 (bad idea?) and I am having problems with
backends. I used to use GTKAgg, it worked ok, but it doesn't seem to work
with python 3?
1- What are my choices running python 3 and matplotlib from source (I
started following the master branch to avoid some bugs in the past, and kept
using it since)? I did look in the docs and searched the lists, but I
couldn't find a clear answer.
2- Is it discouraged to use matplotlib with python 3?
3- I got the Qt4Agg backend sort of working. It displays my figures ok, but
throws exceptions related to some key events I have set up. See below for
backtrace. unichr() has disappeared in python 3, but somehow the backend is
still using it?
Sorry about the post becoming a bit messy. 
Jorge
backtrace:
NameError Traceback (most recent call last)
/home/jscandal/sw/matplotlib/matplotlib/lib/matplotlib/backends/backend_qt4.py
in
keyReleaseEvent(self=<matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg
object>, event=<PyQt4.QtGui.QKeyEvent object>)
 308 
 309 def keyReleaseEvent(self, event):
--> 310 key = self._get_key(event)
 key = undefined
 self._get_key = <bound method FigureCanvasQTAgg._get_key of
<matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg object at 0x7fc124046af8>>
 event = <PyQt4.QtGui.QKeyEvent object at 0x7fc1260cfb88>
 311 if key is None:
 312 return
/home/jscandal/sw/matplotlib/matplotlib/lib/matplotlib/backends/backend_qt4.py
in _get_key(self=<matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg
object>, event=<PyQt4.QtGui.QKeyEvent object>)
 363 return None
 364 
--> 365 key = unichr(event_key)
 key = undefined
 global unichr = undefined
 global event_key = undefined
 366 # qt delivers capitalized letters. fix capitalization
 367 # note that capslock is ignored
NameError: name 'unichr' is not defined