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Unable to pickle.load(fig) with mpl in jupyter notebook #8291

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cbyrohl opened this issue Mar 14, 2017 · 7 comments
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Unable to pickle.load(fig) with mpl in jupyter notebook #8291

cbyrohl opened this issue Mar 14, 2017 · 7 comments
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v3.2.0

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@cbyrohl
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cbyrohl commented Mar 14, 2017 •
edited by tacaswell
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I use the following code snippet, similar to issue #3986 on Py35/matplotlib2.0.0 installed via Anaconda3:

import matplotlib.pyplot as plt
import numpy as np
import pickle



ax = plt.subplot(111)
x = np.linspace(0, 10)
y = np.exp(x)
plt.plot(x, y)
with open('bla.pickle', 'wb') as pickle_file:
    pickle.dump(ax, pickle_file)
import matplotlib.pyplot as plt
import pickle

with open('bla.pickle', 'rb') as pickle_file:
    ax = pickle.load(pickle_file)
plt.show()

The latter pickle.load() fails with:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-23-0e84ab5169e3> in <module>()
     15 
     16 with open('bla.pickle', 'rb') as pickle_file:
---> 17     ax = pickle.load(pickle_file)
     18 plt.show()

/home/uni09/cosmo/cbyrohl/anaconda3/envs/py35/lib/python3.5/site-packages/matplotlib/figure.py in __setstate__(self, state)
   1443             allnums = plt.get_fignums()
   1444             num = max(allnums) + 1 if allnums else 1
-> 1445             mgr = plt._backend_mod.new_figure_manager_given_figure(num, self)
   1446 
   1447             # XXX The following is a copy and paste from pyplot. Consider

AttributeError: module 'ipykernel.pylab.backend_inline' has no attribute 'new_figure_manager_given_figure'

This code was executed in a jupyter notebook (ipython 5.3)..

When executing as usual python script, it works just fine. It also works fine when dumping in Jupyter and loading in script.

[TAC edited to add markup]
@tacaswell
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This should be reported against IPython as they maintain the inline backend.

attn @takluyver

@cbyrohl
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cbyrohl commented Mar 15, 2017

Sure, I reported this in the ipykernel repository.

@takluyver
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@tacaswell is it easy to implement the new_figure_manager_given_figure function? I'm not familiar with what's required for a mpl backend.

tacaswell added a commit to tacaswell/ipykernel that referenced this issue Jan 12, 2020
@tacaswell
FIX: add missing import from backend_agg
edfef85 
closes ipython#231 and matplotlib/matplotlib#8291
This was referenced Jan 12, 2020
Merged
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@tacaswell
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3 years on I finally came back to this...

@tacaswell tacaswell added this to the v3.2.0 milestone Jan 12, 2020
@tacaswell
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tacaswell commented Jan 20, 2020 •
edited
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Closed by #16189 and ipython/ipykernel#476

martinRenou pushed a commit to ipython/matplotlib-inline that referenced this issue Feb 11, 2021
@tacaswell
FIX: add missing import from backend_agg
c7ff849 
closes #231 and matplotlib/matplotlib#8291
@brianjoubert
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brianjoubert commented Dec 28, 2022 •
edited
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Hello,

Is it possible to dump the matplotlib plot in Pickle using the default figure manager and load it in Jupyter notebook.
Basically I tried now to save a plot by running a .py file

`
import numpy as np
import matplotlib.pyplot as plt
import pickle

x = np.linspace(-np.pi, np.pi)
y = np.cos(x)
fig, ax = plt.subplots(1, 1)
ax.plot(x, y, label='cos(x)')
ax.set_xlabel('Time (s)')

pickle.dump((fig, ax), open('myplot.pickle', 'wb'))
`

and then load the produced pickle in a Jupyter Notebook:

`
import matplotlib.pyplot as plt
import pickle

fig, ax = pickle.load(open('myplot.pickle', 'rb'))
ax.set_ylabel('Voltage (mV)')
ax.minorticks_on()
ax.legend()
`

I always get the following message.

AttributeError: 'NoneType' object has no attribute 'new_figure_manager_given_figure'

@jklymak
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jklymak commented Dec 28, 2022

Please open a new issue.

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@tacaswell @takluyver @brianjoubert @jklymak @cbyrohl