mpl 1.5.1 requires pyqt even with a wx backend

[briantoby]

After building a customized miniconda with anaconda/Constructor that contains wxpython but not Qt or Tk, I find that mpl is still requiring that pyqt be installed to simply import. It seems to me to be a bug to require a package that is not really needed.

A subset of packages I am including are listed below:

06/07/2016 04:17 PM 236,150 conda-4.0.8-py27_0.tar.bz2
06/07/2016 04:20 PM 6,409,202 matplotlib-1.5.1-np110py27_0.tar.bz2
06/07/2016 04:17 PM 3,080,830 numpy-1.10.4-py27_0.tar.bz2
06/07/2016 04:18 PM 1,098,309 pyopengl-3.1.1a1-np110py27_0.tar.bz2
06/07/2016 04:15 PM 24,267,498 python-2.7.11-4.tar.bz2
06/07/2016 04:17 PM 629,606 requests-2.10.0-py27_0.tar.bz2
06/07/2016 04:20 PM 11,573,249 scipy-0.16.1-np110py27_1.tar.bz2
06/07/2016 04:17 PM 20,338,598 wxpython-3.0-py27_0.tar.bz2

The error message (somewhat trimmed) is below, but it is clear that simply importing pylab is causing the problem

d:\GSASII>C:\Users\vondreele\g2conda\python.exe GSASII.py
GSAS-II binary directory: d:\GSASII\bin
5 values read from config file d:\GSASII\config.pyc
Traceback (most recent call last):
File "d:\GSASII\GSASIImath.py", line 38, in
import pylab as pl
File "C:\Users\vondreele\g2conda\lib\site-packages\pylab.py", line 1, in
from matplotlib.pylab import *
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\pylab.py", line 274, in
from matplotlib.pyplot import *
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\pyplot.py", line 114, in
backend_mod, new_figure_manager, draw_if_interactive, show = pylab_setup()
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends__init.py", line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line 18, in
from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 15, in
from .backend_qt5 import QtCore
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\backend_qt5.py", line 31, in
from .qt_compat import QtCore, QtGui, QtWidgets, _getSaveFileName, version
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\qt_compat.py", line 162, in
"Matplotlib qt-based backends require an external PyQt4, PyQt5,\n"
ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5,
or PySide package to be installed, but it was not found.

[WeatherGod]

chances are, the default backend is a qt-based one. Double-check your
defaults

On Wed, Jun 8, 2016 at 1:07 PM, Brian Toby notifications@github.com wrote:

After building a customized miniconda with anaconda/Constructor that
contains wxpython but not Qt or Tk, I find that mpl is still requiring that
pyqt be installed to simply import. It seems to me to be a bug to require a
package that is not really needed.

A subset of packages I am including are listed below:

06/07/2016 04:17 PM 236,150 conda-4.0.8-py27_0.tar.bz2
06/07/2016 04:20 PM 6,409,202 matplotlib-1.5.1-np110py27_0.tar.bz2
06/07/2016 04:17 PM 3,080,830 numpy-1.10.4-py27_0.tar.bz2
06/07/2016 04:18 PM 1,098,309 pyopengl-3.1.1a1-np110py27_0.tar.bz2
06/07/2016 04:15 PM 24,267,498 python-2.7.11-4.tar.bz2
06/07/2016 04:17 PM 629,606 requests-2.10.0-py27_0.tar.bz2
06/07/2016 04:20 PM 11,573,249 scipy-0.16.1-np110py27_1.tar.bz2
06/07/2016 04:17 PM 20,338,598 wxpython-3.0-py27_0.tar.bz2

The error message (somewhat trimmed) is below, but it is clear that simply
importing pylab is causing the problem

d:\GSASII>C:\Users\vondreele\g2conda\python.exe GSASII.py
GSAS-II binary directory: d:\GSASII\bin
5 values read from config file d:\GSASII\config.pyc
Traceback (most recent call last):
File "d:\GSASII\GSASIImath.py", line 38, in
import pylab as pl
File "C:\Users\vondreele\g2conda\lib\site-packages\pylab.py", line 1, in
from matplotlib.pylab import *
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\pylab.py",
line 274, in
from matplotlib.pyplot import *
File "C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\pyplot.py",
line 114, in

backend_mod, new_figure_manager, draw_if_interactive, show =
pylab_setup() File
"C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends__init.py",
line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File
"C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\backend_qt4agg.py",
line 18, in
from .backend_qt5agg import FigureCanvasQTAggBase as

_FigureCanvasQTAggBase File
"C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\backend_qt5agg.py",
line 15, in from .backend_qt5 import QtCore File
"C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\backend_qt5.py",
line 31, in from .qt_compat import QtCore, QtGui, QtWidgets,
getSaveFileName, _version
File
"C:\Users\vondreele\g2conda\lib\site-packages\matplotlib\backends\qt_compat.py",
line 162, in
"Matplotlib qt-based backends require an external PyQt4, PyQt5,\n"
ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5,
or PySide package to be installed, but it was not found.

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[briantoby]

How is that done? I know we use wxagg in places.

[tacaswell]

Before import pylab as pl put a

import matplotlib
matplotlib.use('wxagg')

The default rcparams file that is installed with the anaconda package patched to set 'qt4agg' as the default backend.

[tacaswell]

also, for embedding in gsasII you probably should not be importing pylab/pyplot at all and managing your Figure/Canvas objects your self.

[briantoby]

My mistake! There was a stray debug line left in place.