%matplotlib widget fails with pip install

[michaelaye]

Using ipympl 0.2.1 in a py37 env:

$ pip list |grep ipympl                                                                           (py37)
ipympl                            0.2.1

I get this after calling %matplotlib widget:

 ModuleNotFoundError: No module named 'ipympl.backend_nbagg' 
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-9-7b899824b39e> in <module>
----> 1 get_ipython().run_line_magic('matplotlib', 'widget')

~/miniconda3/envs/py37/lib/python3.7/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line, _stack_depth)
   2285                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2286             with self.builtin_trap:
-> 2287                 result = fn(*args,**kwargs)
   2288             return result
   2289 

<decorator-gen-107> in matplotlib(self, line)

~/miniconda3/envs/py37/lib/python3.7/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    185     # but it's overkill for just that one bit of state.
    186     def magic_deco(arg):
--> 187         call = lambda f, *a, **k: f(*a, **k)
    188 
    189         if callable(arg):

~/miniconda3/envs/py37/lib/python3.7/site-packages/IPython/core/magics/pylab.py in matplotlib(self, line)
     97             print("Available matplotlib backends: %s" % backends_list)
     98         else:
---> 99             gui, backend = self.shell.enable_matplotlib(args.gui)
    100             self._show_matplotlib_backend(args.gui, backend)
    101 

~/miniconda3/envs/py37/lib/python3.7/site-packages/IPython/core/interactiveshell.py in enable_matplotlib(self, gui)
   3353                 gui, backend = pt.find_gui_and_backend(self.pylab_gui_select)
   3354 
-> 3355         pt.activate_matplotlib(backend)
   3356         pt.configure_inline_support(self, backend)
   3357 

~/miniconda3/envs/py37/lib/python3.7/site-packages/IPython/core/pylabtools.py in activate_matplotlib(backend)
    312 
    313     import matplotlib.pyplot
--> 314     matplotlib.pyplot.switch_backend(backend)
    315 
    316     # This must be imported last in the matplotlib series, after

~/miniconda3/envs/py37/lib/python3.7/site-packages/matplotlib/pyplot.py in switch_backend(newbackend)
    205         else "matplotlib.backends.backend_{}".format(newbackend.lower()))
    206 
--> 207     backend_mod = importlib.import_module(backend_name)
    208     Backend = type(
    209         "Backend", (matplotlib.backends._Backend,), vars(backend_mod))

~/miniconda3/envs/py37/lib/python3.7/importlib/__init__.py in import_module(name, package)
    125                 break
    126             level += 1
--> 127     return _bootstrap._gcd_import(name[level:], package, level)
    128 
    129 

~/miniconda3/envs/py37/lib/python3.7/importlib/_bootstrap.py in _gcd_import(name, package, level)

~/miniconda3/envs/py37/lib/python3.7/importlib/_bootstrap.py in _find_and_load(name, import_)

~/miniconda3/envs/py37/lib/python3.7/importlib/_bootstrap.py in _find_and_load_unlocked(name, import_)

ModuleNotFoundError: No module named 'ipympl.backend_nbagg'

[michaelaye]

These are my MPL packages:

$ conda list matplotlib                                                                           (py37)
# packages in environment at /Users/klay6683/miniconda3/envs/py37:
#
# Name                    Version                   Build  Channel
matplotlib                3.0.2                    py37_1    conda-forge
matplotlib-base           3.0.2            py37hb2d221d_1    conda-forge
klay6683@MacL3883|~/D/s/pyciss (master↑12|✚6…)

[michaelaye]

seems it was a pip/conda install mishap... sorry for the noise.