Can't pickle or dill FigureCanvasQTAgg

Question

I am trying to dump a figure object into a pickle file and it keeps failing using Python 3.7.1.

#python.version = 3.7.3
#pickle.format_version = '4.0'
#dill.__version__ = '0.2.9'
print(ax, type(ax))
print(matplotlib.get_backend())
print(matplotlib.__version__)
print(sys.version_info)
with open("MyFile", "wb") as dill_file:
    dill.dump(ax, dill_file)
pt.savefig("MyFile_"+now)

The results are:

AxesSubplot(0.125,0.11;0.775x0.35) 
<class'matplotlib.axes._subplots.AxesSubplot'>
Qt5Agg
3.0.2
sys.version_info(major=3, minor=7, micro=1, releaselevel='final', serial=0)

Then the error:

> error from callback : can't pickle FigureCanvasQTAgg objects

The above code is not in a class. I have tried other backends (Agg, TkAgg, etc) with same result. I have also tried using just pickle.dump with same results.

I cannot reproduce. This runs fine for me on python 3.6.6, mpl 3.0.2. — ImportanceOfBeingErnest, Feb 06 '19 at 00:54
@ImportanceOfBeingErnest I am using python 3.7.1, I updated my question. — laserpython, Feb 06 '19 at 16:46
Yeah, but the python version is pretty irrelevant. I just tested and it works with 3.7.1 as well. — ImportanceOfBeingErnest, Feb 06 '19 at 18:26
Bummer. For now I just save data to csv then recall it with a program that plots it... which has a benefit of being a smaller memory footprint. — laserpython, Feb 06 '19 at 19:38

score 0 · Answer 1 · answered Feb 06 '19 at 21:33

0

You should be able to do this, according to Saving interactive Matplotlib figures

... but this is exprimental and has downsides. Consider saving to .SVG file as that answer says.

answered Feb 06 '19 at 21:33

theamk

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Can't pickle or dill FigureCanvasQTAgg

1 Answers1