Pickle figures from matplotlib: 2

Question

Following Pickle figures from matplotlib, I am trying to load a figure from a pickle. I am using the same code with the modifications that are suggested in the responses. Saving script:

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

# Plot simple sinus function
fig_handle = plt.figure()
x = np.linspace(0,2*np.pi)
y = np.sin(x)
plt.plot(x,y)
# plt.show()

# Save figure handle to disk
pl.dump(fig_handle,file('sinus.pickle','wb'))

Loading script:

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

# Load figure from disk and display
fig_handle = pl.load(open('sinus.pickle', 'rb'))
fig_handle.show()

The saving script produces a file named "sinus.pickle" but the loading file does not show the anticipated figure. Any suggestions?

Python 2.7.13 matplotlib 2.0.0 numpy 1.12.1

p.s. following a suggestion replaced fig_handle.show() with pat.show() which produced an error: Traceback (most recent call last):

File "/usr/local/lib/python2.7/
   site-packages/matplotlib/backends/backend_macosx.py", line 109, 
   in_set_device_scale
   self.figure.dpi = self.figure.dpi / self._device_scale * value
   File "/usr/local/lib/python2.7/site-packages/matplotlib/figure.py", 
   line  416, in _set_dpi
   self.callbacks.process('dpi_changed', self)
   File "/usr/local/lib/python2.7/site-packages/matplotlib/cbook.py", 
   line  546, in process
   if s in self.callbacks:
   AttributeError: 'CallbackRegistry' object has no attribute 'callbacks'

`fig.show()` would only work in interactive mode. Else you need to call `plt.show()`. — ImportanceOfBeingErnest, Jan 23 '18 at 12:48
Thanks for your response. I have tried to make this modification to the code and faced the following error: — Gideon Kogan, Jan 24 '18 at 13:23
This might be a problem with the MacOS backend. You may try using a different backend, like "TkAgg". — ImportanceOfBeingErnest, Jan 25 '18 at 11:21

score 0 · Answer 1 · answered Jan 23 '18 at 08:01

0

What you call your "loading script" doesn't make any sense.

From the very link that you provided in your question, loading the picked figure is as simple as:

# Load figure from disk and display
fig_handle2 = pl.load(open('sinus.pickle','rb'))
fig_handle2.show()

answered Jan 23 '18 at 08:01

Diziet Asahi

38,379
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The "loading script" works fine in itself, so maybe it's a bit hard to say that it does not make sense, just calling it "loading script" is a bit confusing, right? – ImportanceOfBeingErnest Jan 23 '18 at 10:04
True, maybe that was harsh. The part that does not make sense is to willingly call a Figure instance `ax` – Diziet Asahi Jan 23 '18 at 10:15

score 0 · Accepted Answer · answered Feb 04 '18 at 11:15

0

Final solution included modification of fig_handle.show() to plt.show() and modification of the backend to "TkAgg", based to an advice given by ImportanceOfBeingErnest

answered Feb 04 '18 at 11:15

Gideon Kogan

662
4
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Pickle figures from matplotlib: 2

2 Answers2