matlplotlib qt magic broken?

[nihalf]

I'm trying to run matlplotlib pyplot interactively using the %matplotlib qt magic. I get the following :

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-6-90119ea04a79> in <module>()
----> 1 get_ipython().magic('matplotlib qt')
      2 plt.plot([1,2,3,4],[1,1.6,4.5, 2])
      3 plt.show()

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in magic(self, arg_s)
   2156         magic_name, _, magic_arg_s = arg_s.partition(' ')
   2157         magic_name = magic_name.lstrip(prefilter.ESC_MAGIC)
-> 2158         return self.run_line_magic(magic_name, magic_arg_s)
   2159 
   2160     #-------------------------------------------------------------------------

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line)
   2077                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2078             with self.builtin_trap:
-> 2079                 result = fn(*args,**kwargs)
   2080             return result
   2081 

<decorator-gen-104> in matplotlib(self, line)

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    186     # but it's overkill for just that one bit of state.
    187     def magic_deco(arg):
--> 188         call = lambda f, *a, **k: f(*a, **k)
    189 
    190         if callable(arg):

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/magics/pylab.py in matplotlib(self, line)
     98             print("Available matplotlib backends: %s" % backends_list)
     99         else:
--> 100             gui, backend = self.shell.enable_matplotlib(args.gui)
    101             self._show_matplotlib_backend(args.gui, backend)
    102 

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in enable_matplotlib(self, gui)
   2945                 gui, backend = pt.find_gui_and_backend(self.pylab_gui_select)
   2946 
-> 2947         pt.activate_matplotlib(backend)
   2948         pt.configure_inline_support(self, backend)
   2949 

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/pylabtools.py in activate_matplotlib(backend)
    293 
    294     import matplotlib.pyplot
--> 295     matplotlib.pyplot.switch_backend(backend)
    296 
    297     # This must be imported last in the matplotlib series, after

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in switch_backend(newbackend)
    231     matplotlib.use(newbackend, warn=False, force=True)
    232     from matplotlib.backends import pylab_setup
--> 233     _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
    234 
    235 

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/__init__.py in pylab_setup()
     30     # imports. 0 means only perform absolute imports.
     31     backend_mod = __import__(backend_name,
---> 32                              globals(),locals(),[backend_name],0)
     33 
     34     # Things we pull in from all backends

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt4agg.py in <module>()
     16 
     17 
---> 18 from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
     19 
     20 from .backend_agg import FigureCanvasAgg

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py in <module>()
     14 
     15 from .backend_agg import FigureCanvasAgg
---> 16 from .backend_qt5 import QtCore
     17 from .backend_qt5 import QtGui
     18 from .backend_qt5 import FigureManagerQT

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py in <module>()
     24 
     25 from matplotlib.widgets import SubplotTool
---> 26 import matplotlib.backends.qt_editor.figureoptions as figureoptions
     27 
     28 from .qt_compat import (QtCore, QtGui, QtWidgets, _getSaveFileName,

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/qt_editor/figureoptions.py in <module>()
     18 import matplotlib
     19 from matplotlib import cm, markers, colors as mcolors
---> 20 import matplotlib.backends.qt_editor.formlayout as formlayout
     21 from matplotlib.backends.qt_compat import QtGui
     22 

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/qt_editor/formlayout.py in <module>()
     54 
     55 from matplotlib import colors as mcolors
---> 56 from matplotlib.backends.qt_compat import QtGui, QtWidgets, QtCore
     57 
     58 

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/qt_compat.py in <module>()
    135     # have been changed in the above if block
    136     if QT_API in [QT_API_PYQT, QT_API_PYQTv2]:  # PyQt4 API
--> 137         from PyQt4 import QtCore, QtGui
    138 
    139         try:

ModuleNotFoundError: No module named 'PyQt4'

Trying to pin PyQt to 4.11 doesn't work because it breaks other dependencies. Any solution?

[ccordoba12]

You need to run

%matplotlib qt5

now, instead of

%matplotlib qt

[nihalf]

Still doesnt fix it. I've checked the matplolibrc file, and the backend specified is Qt5Agg. I still get the "no module named PyQt4" error

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-5-061ce91f2477> in <module>()
      1 df['Adj Close'].plot()
----> 2 get_ipython().magic('matplotlib qt5')
      3 plt.show()

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in magic(self, arg_s)
   2156         magic_name, _, magic_arg_s = arg_s.partition(' ')
   2157         magic_name = magic_name.lstrip(prefilter.ESC_MAGIC)
-> 2158         return self.run_line_magic(magic_name, magic_arg_s)
   2159 
   2160     #-------------------------------------------------------------------------

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line)
   2077                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2078             with self.builtin_trap:
-> 2079                 result = fn(*args,**kwargs)
   2080             return result
   2081 

<decorator-gen-104> in matplotlib(self, line)

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    186     # but it's overkill for just that one bit of state.
    187     def magic_deco(arg):
--> 188         call = lambda f, *a, **k: f(*a, **k)
    189 
    190         if callable(arg):

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/magics/pylab.py in matplotlib(self, line)
     98             print("Available matplotlib backends: %s" % backends_list)
     99         else:
--> 100             gui, backend = self.shell.enable_matplotlib(args.gui)
    101             self._show_matplotlib_backend(args.gui, backend)
    102 

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in enable_matplotlib(self, gui)
   2945                 gui, backend = pt.find_gui_and_backend(self.pylab_gui_select)
   2946 
-> 2947         pt.activate_matplotlib(backend)
   2948         pt.configure_inline_support(self, backend)
   2949 

/home/nihalf/anaconda3/lib/python3.6/site-packages/IPython/core/pylabtools.py in activate_matplotlib(backend)
    293 
    294     import matplotlib.pyplot
--> 295     matplotlib.pyplot.switch_backend(backend)
    296 
    297     # This must be imported last in the matplotlib series, after

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in switch_backend(newbackend)
    231     matplotlib.use(newbackend, warn=False, force=True)
    232     from matplotlib.backends import pylab_setup
--> 233     _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
    234 
    235 

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/__init__.py in pylab_setup()
     30     # imports. 0 means only perform absolute imports.
     31     backend_mod = __import__(backend_name,
---> 32                              globals(),locals(),[backend_name],0)
     33 
     34     # Things we pull in from all backends

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py in <module>()
     14 
     15 from .backend_agg import FigureCanvasAgg
---> 16 from .backend_qt5 import QtCore
     17 from .backend_qt5 import QtGui
     18 from .backend_qt5 import FigureManagerQT

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py in <module>()
     24 
     25 from matplotlib.widgets import SubplotTool
---> 26 import matplotlib.backends.qt_editor.figureoptions as figureoptions
     27 
     28 from .qt_compat import (QtCore, QtGui, QtWidgets, _getSaveFileName,

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/qt_editor/figureoptions.py in <module>()
     18 import matplotlib
     19 from matplotlib import cm, markers, colors as mcolors
---> 20 import matplotlib.backends.qt_editor.formlayout as formlayout
     21 from matplotlib.backends.qt_compat import QtGui
     22 

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/qt_editor/formlayout.py in <module>()
     54 
     55 from matplotlib import colors as mcolors
---> 56 from matplotlib.backends.qt_compat import QtGui, QtWidgets, QtCore
     57 
     58 

/home/nihalf/anaconda3/lib/python3.6/site-packages/matplotlib/backends/qt_compat.py in <module>()
    135     # have been changed in the above if block
    136     if QT_API in [QT_API_PYQT, QT_API_PYQTv2]:  # PyQt4 API
--> 137         from PyQt4 import QtCore, QtGui
    138 
    139         try:

ModuleNotFoundError: No module named 'PyQt4'

[mationai]

Tried suggested

%matplotlib qt5

Errored, see below.

Ok, let's try to install pyqt4, nope, errored:

conda install pyqt=4
Fetching package metadata .........
Solving package specifications: .


UnsatisfiableError: The following specifications were found to be in conflict:
  - pyqt 4* -> python 2.6* -> openssl 1.0.1*
  - python 3.6*
Use "conda info <package>" to see the dependencies for each package.

Info:

conda --version
conda 4.3.13

python --version
Python 3.6.0 :: Continuum Analytics, Inc.

conda list pyqt
pyqt                      5.6.0                    py36_2  

Please help, thank you.

Error:

Warning: Cannot change to a different GUI toolkit: qt5. Using qt instead.
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-3-98ea7e3b93bd> in <module>()
      3 import glob
      4 import matplotlib.pyplot as plt
----> 5 get_ipython().magic('matplotlib qt5')
      6 
      7 

/Users/john/miniconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in magic(self, arg_s)
   2156         magic_name, _, magic_arg_s = arg_s.partition(' ')
   2157         magic_name = magic_name.lstrip(prefilter.ESC_MAGIC)
-> 2158         return self.run_line_magic(magic_name, magic_arg_s)
   2159 
   2160     #-------------------------------------------------------------------------

/Users/john/miniconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line)
   2077                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2078             with self.builtin_trap:
-> 2079                 result = fn(*args,**kwargs)
   2080             return result
   2081 

<decorator-gen-104> in matplotlib(self, line)

/Users/john/miniconda3/lib/python3.6/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    186     # but it's overkill for just that one bit of state.
    187     def magic_deco(arg):
--> 188         call = lambda f, *a, **k: f(*a, **k)
    189 
    190         if callable(arg):

/Users/john/miniconda3/lib/python3.6/site-packages/IPython/core/magics/pylab.py in matplotlib(self, line)
     98             print("Available matplotlib backends: %s" % backends_list)
     99         else:
--> 100             gui, backend = self.shell.enable_matplotlib(args.gui)
    101             self._show_matplotlib_backend(args.gui, backend)
    102 

/Users/john/miniconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py in enable_matplotlib(self, gui)
   2947                 gui, backend = pt.find_gui_and_backend(self.pylab_gui_select)
   2948 
-> 2949         pt.activate_matplotlib(backend)
   2950         pt.configure_inline_support(self, backend)
   2951 

/Users/john/miniconda3/lib/python3.6/site-packages/IPython/core/pylabtools.py in activate_matplotlib(backend)
    306 
    307     import matplotlib.pyplot
--> 308     matplotlib.pyplot.switch_backend(backend)
    309 
    310     # This must be imported last in the matplotlib series, after

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in switch_backend(newbackend)
    231     matplotlib.use(newbackend, warn=False, force=True)
    232     from matplotlib.backends import pylab_setup
--> 233     _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
    234 
    235 

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/__init__.py in pylab_setup()
     30     # imports. 0 means only perform absolute imports.
     31     backend_mod = __import__(backend_name,
---> 32                              globals(),locals(),[backend_name],0)
     33 
     34     # Things we pull in from all backends

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt4agg.py in <module>()
     16 
     17 
---> 18 from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
     19 
     20 from .backend_agg import FigureCanvasAgg

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py in <module>()
     14 
     15 from .backend_agg import FigureCanvasAgg
---> 16 from .backend_qt5 import QtCore
     17 from .backend_qt5 import QtGui
     18 from .backend_qt5 import FigureManagerQT

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py in <module>()
     24 
     25 from matplotlib.widgets import SubplotTool
---> 26 import matplotlib.backends.qt_editor.figureoptions as figureoptions
     27 
     28 from .qt_compat import (QtCore, QtGui, QtWidgets, _getSaveFileName,

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/qt_editor/figureoptions.py in <module>()
     18 import matplotlib
     19 from matplotlib import cm, markers, colors as mcolors
---> 20 import matplotlib.backends.qt_editor.formlayout as formlayout
     21 from matplotlib.backends.qt_compat import QtGui
     22 

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/qt_editor/formlayout.py in <module>()
     54 
     55 from matplotlib import colors as mcolors
---> 56 from matplotlib.backends.qt_compat import QtGui, QtWidgets, QtCore
     57 
     58 

/Users/john/miniconda3/lib/python3.6/site-packages/matplotlib/backends/qt_compat.py in <module>()
    135     # have been changed in the above if block
    136     if QT_API in [QT_API_PYQT, QT_API_PYQTv2]:  # PyQt4 API
--> 137         from PyQt4 import QtCore, QtGui
    138 
    139         try:

ModuleNotFoundError: No module named 'PyQt4'

[mationai]

Retried with python 3.5.2 env, exactly the same

ModuleNotFoundError: No module named 'PyQt4'

error.

[nihalf]

For anybody else with this error when using Jupyter notebooks, a workaround is to specify the "nbagg" backend when importing matplotlib. It isn't great if you want to use Qt5, but it will do in a pinch.

[mationai]

Ok,

conda install qt=4

in python 3.5.2 env made the error go away. Have not tried this in 3.6.0 env yet.

But error still exists with the default qt and pyqt of 5.x

[mingwandroid]

This works completely fine for me on macOS. Here is the procedure I followed, from start to finish. @nihalf, @fuzzthink, please try it and post your results:

pushd /tmp
curl -SLO https://repo.continuum.io/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
bash ./Miniconda3-latest-MacOSX-x86_64.sh -b -p /tmp/mpl
source /tmp/mpl/bin/activate
conda install jupyter ipython matplotlib -y
jupyter notebook

In a new Python 3 notebook:

get_ipython().magic('matplotlib qt5')
import matplotlib.pyplot as plt
plt.plot([1,2,3,4],[1,1.6,4.5, 2])

Finally, to cleanup:

rm -rf /tmp/mpl

[mingwandroid]

Please can you give the requested feedback on this issue?

[ccordoba12]

@mingwandroid, I think we could merge this one with issue #1068.

[JunHuang023]

@mingwandroid, Hi, you suggestion worked for me, I was not sure about what I have done, though.
I noticed that
(root) somename-MacBook-Pro:myname$ ,
previously it was like:
somename-MacBook-Pro:myname$ ,
Does this means I am running my mac as "root", do I need to go back the "routine" as a a "user"?
if so, what do I needs to do?
Thanks!

[mingwandroid]

I was not sure about what I have done, though.

All we have done here is to create a brand new temporary installation of Miniconda to show that, under such a clean/fresh install, matplotlib with the qt backend works fine. This means that any problems you are having with your other installation are not system-wide issues (i.e. they are isolated to that installation).

Does this means I am running my mac as "root"

No it doesn't. (root) here is referring to the root conda environment and has nothing to do with your user (which is by the look of it, myname).

[Gerenuk]

I've just had similar issues. ipython profile create fixed it for me, which creates the two (default) config files.

[mingwandroid]

Closing due to lack of requested feedback.