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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Memory leak with colorbar.make_axes","articleBody":"### Bug summary\n\nWhen using `matplotlib.colorbar.make_axes` function, `plt.close()` does not clear the new colorbar axes from memory. Tested for the Qt5 backend only. Maybe related to #22002, at least in the sense that I see no leak for Qt5 when no colorbar axes are added.\n\n### Code for reproduction\n\n```python\n%pylab qt5\r\nfrom matplotlib import colorbar\r\nimport psutil\r\nimport gc\r\n\r\np = psutil.Process()\r\nfor i in range(5):\r\n    fig, ax = plt.subplots(1,1)\r\n    ax.imshow(random.normal(size=(100,100)))\r\n    cax = colorbar.make_axes(ax)\r\n    plt.savefig(\"test.png\")\r\n    plt.pause(0.1)\r\n    plt.close(fig)\r\n    del fig\r\n    del ax\r\n    del cax\r\n    gc.collect()\r\n    print(p.memory_full_info().uss/1e6)\n```\n\n\n### Actual outcome\n\n250.744832\r\n255.209472\r\n259.514368\r\n264.13056\r\n268.099584\n\n### Expected outcome\n\nConstant memory usage, as is when the line\r\n`    cax = colorbar.make_axes(ax)`\r\nis commented out.\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nWindows\n\n### Matplotlib Version\n\n3.4.2\n\n### Matplotlib Backend\n\nQt5Agg (PyQt)\n\n### Python version\n\n3.7.6\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nfrom source (.tar.gz)","author":{"url":"https://github.com/vdrhtc","@type":"Person","name":"vdrhtc"},"datePublished":"2022-01-02T20:32:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/22085/matplotlib/issues/22085"}