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Cannot import pyplot. NameError: 'FigureManagerWebAgg' is not defined #9380

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cknd opened this issue Oct 12, 2017 · 5 comments
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Cannot import pyplot. NameError: 'FigureManagerWebAgg' is not defined #9380

cknd opened this issue Oct 12, 2017 · 5 comments
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GUI: webagg Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.
Milestone
v2.1.1

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@cknd
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cknd commented Oct 12, 2017

Bug report

When using the webagg backend on 2.1.0, importing pyplot fails with a NameError.

Code for reproduction

import matplotlib
matplotlib.use('WebAgg')
from matplotlib import pyplot

Actual outcome

I get a name error. traceback excerpt:

.../python3.6/site-packages/matplotlib/backends/__init__.py in pylab_setup(name)
     58     # imports. 0 means only perform absolute imports.
     59     backend_mod = __import__(backend_name, globals(), locals(),
---> 60                              [backend_name], 0)
     61 
     62     # Things we pull in from all backends

.../python3.6/site-packages/matplotlib/backends/backend_webagg.py in <module>()
    325 
    326 @_Backend.export
--> 327 class _BackendWebAgg(_Backend):
    328     FigureCanvas = FigureCanvasWebAgg
    329     FigureManager = FigureManagerWebAgg

.../python3.6/site-packages/matplotlib/backends/backend_webagg.py in _BackendWebAgg()
    327 class _BackendWebAgg(_Backend):
    328     FigureCanvas = FigureCanvasWebAgg
--> 329     FigureManager = FigureManagerWebAgg
    330 
    331     @staticmethod

NameError: name 'FigureManagerWebAgg' is not defined

Matplotlib version

  • Operating system: Mac OS 10.12.6
  • Matplotlib version: 2.1.0
  • Matplotlib backend (print(matplotlib.get_backend())): WebAgg
  • Python version: Python 3.6.2
  • Jupyter version (if applicable): -
  • Other libraries:

I installed matplotlib via pip.
@cknd
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cknd commented Oct 12, 2017 •
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cursory glance suggests that FigureManagerWebAgg has simply moved to core. this works on my machine:

# in matplotlib/backends/backend_webagg.py,  line 329
@_Backend.export
class _BackendWebAgg(_Backend):
    FigureCanvas = FigureCanvasWebAgg
    FigureManager = core.FigureManagerWebAgg   # !

(I'm on the go and can't make a proper PR right now. also not sure this is a complete fix - I can import pyplot now, but when I show a figure, the browser window opens with the "WebAgg current figures" title but stays blank)

@anntzer anntzer mentioned this issue Oct 12, 2017
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@anntzer
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anntzer commented Oct 12, 2017 •
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Even with the fix in #9347 this stays broken (with the symptoms described in the second message) bisecting back to #9027.
Note that while #9027 is supposed to "only" revert #5754, the webagg backend was working even before #5754 was merged, so I guess something got broken during the revert.

@anntzer anntzer added GUI: webagg Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. labels Oct 12, 2017
@tacaswell tacaswell added this to the 2.1.1 (next bug fix release) milestone Oct 13, 2017
@tacaswell
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The issue is that #6370 fixed webagg for renamed files in #5754 but the reversion did not.

@tacaswell
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PR coming shortly....got side-tracked by ipython/ipython#10867

tacaswell added a commit to tacaswell/matplotlib that referenced this issue Oct 23, 2017
@tacaswell
FIX: move js files to expected location
0e688ff 
These files were moved as part of matplotlib#5754 which was reverted in matplotlib#9027,
however matplotlib#6370 fixed the paths, but was not also reverted.

Putting the js files in sub-directory makes sense, move the files
rather than revert the changes in matplotlib#6370.

fixes matplotlib#9380
@tacaswell tacaswell mentioned this issue Oct 23, 2017
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@anntzer
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anntzer commented Nov 1, 2017

closed by #9534, afaict

@anntzer anntzer closed this as completed Nov 1, 2017
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