René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Some styles trigger pcolormesh grid deprecation","articleBody":"### Bug summary\r\n\r\nCalling `plot_surface` followed by `fig.colorbar` results in the following deprecation warning:\r\n```\r\nAuto-removal of grids by pcolor() and pcolormesh() is deprecated since 3.5\r\nand will be removed two minor releases later; please call grid(False) first.\r\n```\r\nHowever, setting `ax.grid(False)` first does not help, the Warning is still shown.\r\n\r\n### Code for reproduction\r\n\r\nEdit: As noted further down in the discussion: The warning does not appear for the default style. But if you load, e.g., `plt.style.use('bmh')`, you will see the warning.\r\n\r\n```python\r\n# https://matplotlib.org/stable/gallery/mplot3d/surface3d.html\r\n\r\nimport matplotlib.pyplot as plt\r\nfrom matplotlib import cm\r\nfrom matplotlib.ticker import LinearLocator\r\nimport numpy as np\r\n\r\nplt.style.use('bmh')  # Edit: One of the styles with which you will see the warning\r\n\r\nfig, ax = plt.subplots(subplot_kw={\"projection\": \"3d\"})\r\n\r\n# Make data.\r\nX = np.arange(-5, 5, 0.25)\r\nY = np.arange(-5, 5, 0.25)\r\nX, Y = np.meshgrid(X, Y)\r\nR = np.sqrt(X**2 + Y**2)\r\nZ = np.sin(R)\r\n\r\n# Plot the surface.\r\nsurf = ax.plot_surface(X, Y, Z, cmap=cm.coolwarm,\r\n                       linewidth=0, antialiased=False)\r\n\r\n# Customize the z axis.\r\nax.set_zlim(-1.01, 1.01)\r\nax.zaxis.set_major_locator(LinearLocator(10))\r\n# A StrMethodFormatter is used automatically\r\nax.zaxis.set_major_formatter('{x:.02f}')\r\n\r\n# Add a color bar which maps values to colors.\r\nfig.colorbar(surf, shrink=0.5, aspect=5)\r\n\r\nplt.show()\r\n```\r\n\r\n\r\n### Actual outcome\r\n```\r\n MatplotlibDeprecationWarning: Auto-removal of grids by pcolor() and pcolormesh() is deprecated\r\n since 3.5 and will be removed two minor releases later; please call grid(False) first.\r\n fig.colorbar(surf, shrink=0.5, aspect=5)\r\n```\r\n\r\n### Expected outcome\r\n\r\nNo Warning or a warning with a fix that works.\r\n\r\n### Additional information\r\n\r\nWorks fine for `matplotlib\u003c3.5`.\r\n\r\n### Operating system\r\n\r\nLinux\r\n\r\n### Matplotlib Version\r\n\r\n3.5.0\r\n\r\n### Matplotlib Backend\r\n\r\nmodule://ipykernel.pylab.backend_inline\r\n\r\n### Python version\r\n\r\n3.88\r\n\r\n### Jupyter version\r\n\r\n6.4.0\r\n\r\n### Installation\r\n\r\nconda","author":{"url":"https://github.com/prisae","@type":"Person","name":"prisae"},"datePublished":"2021-11-23T06:00:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":17},"url":"https://github.com/21723/matplotlib/issues/21723"}