Fixed Image and Renderer pickling#3627
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tacaswell merged 2 commits intomatplotlib:v1.4.xfrom Oct 10, 2014
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keeping this comment around might be helpful...
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Woops. I put it back in the wrong place. Still, it applies unilaterally.
tacaswell
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BUG : Fixed Image and Renderer pickling
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Received this email: Suggesting that it may be necessary to add and _imache = None on re-initialization. |
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Not necessarily. It is an easy fix though. Give me 5 minutes and I'll push up a PR. |
This was referenced Feb 1, 2015
anntzer
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Upon drawing, Line2D objects would store a reference to one of their own bound methods as their `_lineFunc` argument. This would lead to them being gc'ed not when going out of scope, but only when the "true" gc kicks in; additionally this led to some pickle-related bugs (matplotlib#3627). One can easily sidestep this problem by not storing this bound method. To check the behavior, try (py3.4+ only): ``` import gc import weakref from matplotlib import pyplot as plt def f(): fig, ax = plt.subplots() img = ax.imshow([[0, 1], [2, 3]]) weakref.finalize(img, print, "gc'ing image") l, = plt.plot([0, 1]) weakref.finalize(l, print, "gc'ing line") fig.canvas.draw() img.remove() l.remove() f() print("we have left the function") gc.collect() print("and cleaned up our mess") ``` Before the patch, the AxesImage is gc'ed when the function exits but the Line2D only upon explicit garbage collection. After the patch, both are collected immediately.
anntzer
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Jul 24, 2016
Upon drawing, Line2D objects would store a reference to one of their own bound methods as their `_lineFunc` argument. This would lead to them being gc'ed not when going out of scope, but only when the "true" gc kicks in; additionally this led to some pickle-related bugs (matplotlib#3627). One can easily sidestep this problem by not storing this bound method. To check the behavior, try (py3.4+ only): ``` import gc import weakref from matplotlib import pyplot as plt def f(): fig, ax = plt.subplots() img = ax.imshow([[0, 1], [2, 3]]) weakref.finalize(img, print, "gc'ing image") l, = plt.plot([0, 1]) weakref.finalize(l, print, "gc'ing line") fig.canvas.draw() img.remove() l.remove() f() print("we have left the function") gc.collect() print("and cleaned up our mess") ``` Before the patch, the AxesImage is gc'ed when the function exits but the Line2D only upon explicit garbage collection. After the patch, both are collected immediately.
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Fixes #3614 and uqfoundation/dill#4 as well as likely fixing #3392.