René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: FontProperties objects are not deleted when using fig.savefig","articleBody":"### Bug summary\n\nWhen repeatedly making a plot and saving it with fig.savefig, the number of FontProperties objects keep increasing. This does not occur without the savefig.\n\n### Code for reproduction\n\n```Python\nimport gc\r\nfrom collections import Counter\r\nfrom pathlib import Path\r\n\r\nimport matplotlib.pyplot as plt\r\n\r\nfor i in range(20):\r\n    fig, ax = plt.subplots()\r\n    fig.savefig(Path(f\"~/test_{i}.png\").expanduser())\r\n    plt.close(fig)\r\n\r\n    gc.collect()\r\n    object_counts = Counter(f\"{type(obj).__module__}.{type(obj).__name__}\" for obj in gc.get_objects())\r\n    print(object_counts['matplotlib.font_manager.FontProperties'], end=\", \")\n```\n\n\n### Actual outcome\n\n`43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 120, 127, 134, 141, 148, 155, 162, 169, 176, `\n\n### Expected outcome\n\n`43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, `\n\n### Additional information\n\n\u003cdetails\u003e\u003csummary\u003ercParams: \u003c/summary\u003e\r\n`\r\nRcParams({'_internal.classic_mode': False,\r\n          'agg.path.chunksize': 0,\r\n          'animation.bitrate': -1,\r\n          'animation.codec': 'h264',\r\n          'animation.convert_args': ['-layers', 'OptimizePlus'],\r\n          'animation.convert_path': 'convert',\r\n          'animation.embed_limit': 20.0,\r\n          'animation.ffmpeg_args': [],\r\n          'animation.ffmpeg_path': 'ffmpeg',\r\n          'animation.frame_format': 'png',\r\n          'animation.html': 'none',\r\n          'animation.writer': 'ffmpeg',\r\n          'axes.autolimit_mode': 'data',\r\n          'axes.axisbelow': 'line',\r\n          'axes.edgecolor': 'black',\r\n          'axes.facecolor': 'white',\r\n          'axes.formatter.limits': [-5, 6],\r\n          'axes.formatter.min_exponent': 0,\r\n          'axes.formatter.offset_threshold': 4,\r\n          'axes.formatter.use_locale': False,\r\n          'axes.formatter.use_mathtext': False,\r\n          'axes.formatter.useoffset': True,\r\n          'axes.grid': False,\r\n          'axes.grid.axis': 'both',\r\n          'axes.grid.which': 'major',\r\n          'axes.labelcolor': 'black',\r\n          'axes.labelpad': 4.0,\r\n          'axes.labelsize': 'medium',\r\n          'axes.labelweight': 'normal',\r\n          'axes.linewidth': 0.8,\r\n          'axes.prop_cycle': cycler('color', ['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd', '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf']),\r\n          'axes.spines.bottom': True,\r\n          'axes.spines.left': True,\r\n          'axes.spines.right': True,\r\n          'axes.spines.top': True,\r\n          'axes.titlecolor': 'auto',\r\n          'axes.titlelocation': 'center',\r\n          'axes.titlepad': 6.0,\r\n          'axes.titlesize': 'large',\r\n          'axes.titleweight': 'normal',\r\n          'axes.titley': None,\r\n          'axes.unicode_minus': True,\r\n          'axes.xmargin': 0.05,\r\n          'axes.ymargin': 0.05,\r\n          'axes.zmargin': 0.05,\r\n          'axes3d.grid': True,\r\n          'axes3d.xaxis.panecolor': (0.95, 0.95, 0.95, 0.5),\r\n          'axes3d.yaxis.panecolor': (0.9, 0.9, 0.9, 0.5),\r\n          'axes3d.zaxis.panecolor': (0.925, 0.925, 0.925, 0.5),\r\n          'backend': 'Qt5Agg',\r\n          'backend_fallback': True,\r\n          'boxplot.bootstrap': None,\r\n          'boxplot.boxprops.color': 'black',\r\n          'boxplot.boxprops.linestyle': '-',\r\n          'boxplot.boxprops.linewidth': 1.0,\r\n          'boxplot.capprops.color': 'black',\r\n          'boxplot.capprops.linestyle': '-',\r\n          'boxplot.capprops.linewidth': 1.0,\r\n          'boxplot.flierprops.color': 'black',\r\n          'boxplot.flierprops.linestyle': 'none',\r\n          'boxplot.flierprops.linewidth': 1.0,\r\n          'boxplot.flierprops.marker': 'o',\r\n          'boxplot.flierprops.markeredgecolor': 'black',\r\n          'boxplot.flierprops.markeredgewidth': 1.0,\r\n          'boxplot.flierprops.markerfacecolor': 'none',\r\n          'boxplot.flierprops.markersize': 6.0,\r\n          'boxplot.meanline': False,\r\n          'boxplot.meanprops.color': 'C2',\r\n          'boxplot.meanprops.linestyle': '--',\r\n          'boxplot.meanprops.linewidth': 1.0,\r\n          'boxplot.meanprops.marker': '^',\r\n          'boxplot.meanprops.markeredgecolor': 'C2',\r\n          'boxplot.meanprops.markerfacecolor': 'C2',\r\n          'boxplot.meanprops.markersize': 6.0,\r\n          'boxplot.medianprops.color': 'C1',\r\n          'boxplot.medianprops.linestyle': '-',\r\n          'boxplot.medianprops.linewidth': 1.0,\r\n          'boxplot.notch': False,\r\n          'boxplot.patchartist': False,\r\n          'boxplot.showbox': True,\r\n          'boxplot.showcaps': True,\r\n          'boxplot.showfliers': True,\r\n          'boxplot.showmeans': False,\r\n          'boxplot.vertical': True,\r\n          'boxplot.whiskerprops.color': 'black',\r\n          'boxplot.whiskerprops.linestyle': '-',\r\n          'boxplot.whiskerprops.linewidth': 1.0,\r\n          'boxplot.whiskers': 1.5,\r\n          'contour.algorithm': 'mpl2014',\r\n          'contour.corner_mask': True,\r\n          'contour.linewidth': None,\r\n          'contour.negative_linestyle': 'dashed',\r\n          'date.autoformatter.day': '%Y-%m-%d',\r\n          'date.autoformatter.hour': '%m-%d %H',\r\n          'date.autoformatter.microsecond': '%M:%S.%f',\r\n          'date.autoformatter.minute': '%d %H:%M',\r\n          'date.autoformatter.month': '%Y-%m',\r\n          'date.autoformatter.second': '%H:%M:%S',\r\n          'date.autoformatter.year': '%Y',\r\n          'date.converter': 'auto',\r\n          'date.epoch': '1970-01-01T00:00:00',\r\n          'date.interval_multiples': True,\r\n          'docstring.hardcopy': False,\r\n          'errorbar.capsize': 0.0,\r\n          'figure.autolayout': False,\r\n          'figure.constrained_layout.h_pad': 0.04167,\r\n          'figure.constrained_layout.hspace': 0.02,\r\n          'figure.constrained_layout.use': False,\r\n          'figure.constrained_layout.w_pad': 0.04167,\r\n          'figure.constrained_layout.wspace': 0.02,\r\n          'figure.dpi': 100.0,\r\n          'figure.edgecolor': 'white',\r\n          'figure.facecolor': 'white',\r\n          'figure.figsize': [6.4, 4.8],\r\n          'figure.frameon': True,\r\n          'figure.hooks': [],\r\n          'figure.labelsize': 'large',\r\n          'figure.labelweight': 'normal',\r\n          'figure.max_open_warning': 20,\r\n          'figure.raise_window': True,\r\n          'figure.subplot.bottom': 0.11,\r\n          'figure.subplot.hspace': 0.2,\r\n          'figure.subplot.left': 0.125,\r\n          'figure.subplot.right': 0.9,\r\n          'figure.subplot.top': 0.88,\r\n          'figure.subplot.wspace': 0.2,\r\n          'figure.titlesize': 'large',\r\n          'figure.titleweight': 'normal',\r\n          'font.cursive': ['Apple Chancery',\r\n                           'Textile',\r\n                           'Zapf Chancery',\r\n                           'Sand',\r\n                           'Script MT',\r\n                           'Felipa',\r\n                           'Comic Neue',\r\n                           'Comic Sans MS',\r\n                           'cursive'],\r\n          'font.family': ['sans-serif'],\r\n          'font.fantasy': ['Chicago',\r\n                           'Charcoal',\r\n                           'Impact',\r\n                           'Western',\r\n                           'xkcd script',\r\n                           'fantasy'],\r\n          'font.monospace': ['DejaVu Sans Mono',\r\n                             'Bitstream Vera Sans Mono',\r\n                             'Computer Modern Typewriter',\r\n                             'Andale Mono',\r\n                             'Nimbus Mono L',\r\n                             'Courier New',\r\n                             'Courier',\r\n                             'Fixed',\r\n                             'Terminal',\r\n                             'monospace'],\r\n          'font.sans-serif': ['DejaVu Sans',\r\n                              'Bitstream Vera Sans',\r\n                              'Computer Modern Sans Serif',\r\n                              'Lucida Grande',\r\n                              'Verdana',\r\n                              'Geneva',\r\n                              'Lucid',\r\n                              'Arial',\r\n                              'Helvetica',\r\n                              'Avant Garde',\r\n                              'sans-serif'],\r\n          'font.serif': ['DejaVu Serif',\r\n                         'Bitstream Vera Serif',\r\n                         'Computer Modern Roman',\r\n                         'New Century Schoolbook',\r\n                         'Century Schoolbook L',\r\n                         'Utopia',\r\n                         'ITC Bookman',\r\n                         'Bookman',\r\n                         'Nimbus Roman No9 L',\r\n                         'Times New Roman',\r\n                         'Times',\r\n                         'Palatino',\r\n                         'Charter',\r\n                         'serif'],\r\n          'font.size': 10.0,\r\n          'font.stretch': 'normal',\r\n          'font.style': 'normal',\r\n          'font.variant': 'normal',\r\n          'font.weight': 'normal',\r\n          'grid.alpha': 1.0,\r\n          'grid.color': '#b0b0b0',\r\n          'grid.linestyle': '-',\r\n          'grid.linewidth': 0.8,\r\n          'hatch.color': 'black',\r\n          'hatch.linewidth': 1.0,\r\n          'hist.bins': 10,\r\n          'image.aspect': 'equal',\r\n          'image.cmap': 'viridis',\r\n          'image.composite_image': True,\r\n          'image.interpolation': 'antialiased',\r\n          'image.lut': 256,\r\n          'image.origin': 'upper',\r\n          'image.resample': True,\r\n          'interactive': True,\r\n          'keymap.back': ['left', 'c', 'backspace', 'MouseButton.BACK'],\r\n          'keymap.copy': ['ctrl+c', 'cmd+c'],\r\n          'keymap.forward': ['right', 'v', 'MouseButton.FORWARD'],\r\n          'keymap.fullscreen': ['f', 'ctrl+f'],\r\n          'keymap.grid': ['g'],\r\n          'keymap.grid_minor': ['G'],\r\n          'keymap.help': ['f1'],\r\n          'keymap.home': ['h', 'r', 'home'],\r\n          'keymap.pan': ['p'],\r\n          'keymap.quit': ['ctrl+w', 'cmd+w', 'q'],\r\n          'keymap.quit_all': [],\r\n          'keymap.save': ['s', 'ctrl+s'],\r\n          'keymap.xscale': ['k', 'L'],\r\n          'keymap.yscale': ['l'],\r\n          'keymap.zoom': ['o'],\r\n          'legend.borderaxespad': 0.5,\r\n          'legend.borderpad': 0.4,\r\n          'legend.columnspacing': 2.0,\r\n          'legend.edgecolor': '0.8',\r\n          'legend.facecolor': 'inherit',\r\n          'legend.fancybox': True,\r\n          'legend.fontsize': 'medium',\r\n          'legend.framealpha': 0.8,\r\n          'legend.frameon': True,\r\n          'legend.handleheight': 0.7,\r\n          'legend.handlelength': 2.0,\r\n          'legend.handletextpad': 0.8,\r\n          'legend.labelcolor': 'None',\r\n          'legend.labelspacing': 0.5,\r\n          'legend.loc': 'best',\r\n          'legend.markerscale': 1.0,\r\n          'legend.numpoints': 1,\r\n          'legend.scatterpoints': 1,\r\n          'legend.shadow': False,\r\n          'legend.title_fontsize': None,\r\n          'lines.antialiased': True,\r\n          'lines.color': 'C0',\r\n          'lines.dash_capstyle': \u003cCapStyle.butt: 'butt'\u003e,\r\n          'lines.dash_joinstyle': \u003cJoinStyle.round: 'round'\u003e,\r\n          'lines.dashdot_pattern': [6.4, 1.6, 1.0, 1.6],\r\n          'lines.dashed_pattern': [3.7, 1.6],\r\n          'lines.dotted_pattern': [1.0, 1.65],\r\n          'lines.linestyle': '-',\r\n          'lines.linewidth': 1.5,\r\n          'lines.marker': 'None',\r\n          'lines.markeredgecolor': 'auto',\r\n          'lines.markeredgewidth': 1.0,\r\n          'lines.markerfacecolor': 'auto',\r\n          'lines.markersize': 6.0,\r\n          'lines.scale_dashes': True,\r\n          'lines.solid_capstyle': \u003cCapStyle.projecting: 'projecting'\u003e,\r\n          'lines.solid_joinstyle': \u003cJoinStyle.round: 'round'\u003e,\r\n          'macosx.window_mode': 'system',\r\n          'markers.fillstyle': 'full',\r\n          'mathtext.bf': 'sans:bold',\r\n          'mathtext.bfit': 'sans:italic:bold',\r\n          'mathtext.cal': 'cursive',\r\n          'mathtext.default': 'it',\r\n          'mathtext.fallback': 'cm',\r\n          'mathtext.fontset': 'dejavusans',\r\n          'mathtext.it': 'sans:italic',\r\n          'mathtext.rm': 'sans',\r\n          'mathtext.sf': 'sans',\r\n          'mathtext.tt': 'monospace',\r\n          'patch.antialiased': True,\r\n          'patch.edgecolor': 'black',\r\n          'patch.facecolor': 'C0',\r\n          'patch.force_edgecolor': False,\r\n          'patch.linewidth': 1.0,\r\n          'path.effects': [],\r\n          'path.simplify': True,\r\n          'path.simplify_threshold': 0.111111111111,\r\n          'path.sketch': None,\r\n          'path.snap': True,\r\n          'pcolor.shading': 'auto',\r\n          'pcolormesh.snap': True,\r\n          'pdf.compression': 6,\r\n          'pdf.fonttype': 3,\r\n          'pdf.inheritcolor': False,\r\n          'pdf.use14corefonts': False,\r\n          'pgf.preamble': '',\r\n          'pgf.rcfonts': True,\r\n          'pgf.texsystem': 'xelatex',\r\n          'polaraxes.grid': True,\r\n          'ps.distiller.res': 6000,\r\n          'ps.fonttype': 3,\r\n          'ps.papersize': 'letter',\r\n          'ps.useafm': False,\r\n          'ps.usedistiller': None,\r\n          'savefig.bbox': None,\r\n          'savefig.directory': '~',\r\n          'savefig.dpi': 'figure',\r\n          'savefig.edgecolor': 'auto',\r\n          'savefig.facecolor': 'auto',\r\n          'savefig.format': 'png',\r\n          'savefig.orientation': 'portrait',\r\n          'savefig.pad_inches': 0.1,\r\n          'savefig.transparent': False,\r\n          'scatter.edgecolors': 'face',\r\n          'scatter.marker': 'o',\r\n          'svg.fonttype': 'path',\r\n          'svg.hashsalt': None,\r\n          'svg.image_inline': True,\r\n          'text.antialiased': True,\r\n          'text.color': 'black',\r\n          'text.hinting': 'force_autohint',\r\n          'text.hinting_factor': 8,\r\n          'text.kerning_factor': 0,\r\n          'text.latex.preamble': '',\r\n          'text.parse_math': True,\r\n          'text.usetex': False,\r\n          'timezone': 'UTC',\r\n          'tk.window_focus': False,\r\n          'toolbar': 'toolbar2',\r\n          'webagg.address': '127.0.0.1',\r\n          'webagg.open_in_browser': True,\r\n          'webagg.port': 8988,\r\n          'webagg.port_retries': 50,\r\n          'xaxis.labellocation': 'center',\r\n          'xtick.alignment': 'center',\r\n          'xtick.bottom': True,\r\n          'xtick.color': 'black',\r\n          'xtick.direction': 'out',\r\n          'xtick.labelbottom': True,\r\n          'xtick.labelcolor': 'inherit',\r\n          'xtick.labelsize': 'medium',\r\n          'xtick.labeltop': False,\r\n          'xtick.major.bottom': True,\r\n          'xtick.major.pad': 3.5,\r\n          'xtick.major.size': 3.5,\r\n          'xtick.major.top': True,\r\n          'xtick.major.width': 0.8,\r\n          'xtick.minor.bottom': True,\r\n          'xtick.minor.ndivs': 'auto',\r\n          'xtick.minor.pad': 3.4,\r\n          'xtick.minor.size': 2.0,\r\n          'xtick.minor.top': True,\r\n          'xtick.minor.visible': False,\r\n          'xtick.minor.width': 0.6,\r\n          'xtick.top': False,\r\n          'yaxis.labellocation': 'center',\r\n          'ytick.alignment': 'center_baseline',\r\n          'ytick.color': 'black',\r\n          'ytick.direction': 'out',\r\n          'ytick.labelcolor': 'inherit',\r\n          'ytick.labelleft': True,\r\n          'ytick.labelright': False,\r\n          'ytick.labelsize': 'medium',\r\n          'ytick.left': True,\r\n          'ytick.major.left': True,\r\n          'ytick.major.pad': 3.5,\r\n          'ytick.major.right': True,\r\n          'ytick.major.size': 3.5,\r\n          'ytick.major.width': 0.8,\r\n          'ytick.minor.left': True,\r\n          'ytick.minor.ndivs': 'auto',\r\n          'ytick.minor.pad': 3.4,\r\n          'ytick.minor.right': True,\r\n          'ytick.minor.size': 2.0,\r\n          'ytick.minor.visible': False,\r\n          'ytick.minor.width': 0.6,\r\n          'ytick.right': False})\r\n`\r\n\u003c/details\u003e\r\n\r\nThis happens with both the \"Qt5Agg\" and \"Agg\" backends.\n\n### Operating system\n\nWindows\n\n### Matplotlib Version\n\n3.8.4\n\n### Matplotlib Backend\n\nQt5Agg\n\n### Python version\n\n3.10.11\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/haroldmeerwaldt","@type":"Person","name":"haroldmeerwaldt"},"datePublished":"2024-09-16T12:01:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/28827/matplotlib/issues/28827"}