René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"figure created using figure.Figure doesn't save figure","articleBody":"Figure object created using \"from matplotlib import figure\" is not able to save figure.\r\n\r\n**Code for reproduction**\r\n\r\n```\r\nimport matplotlib.pyplot as plt\r\nimport matplotlib.gridspec as gridspec\r\nfrom matplotlib import figure\r\n\r\ndef figure_bug(file):\r\n    fig = figure.Figure(figsize=(2,5), constrained_layout=True)\r\n    gs = gridspec.GridSpec(5, 1, figure=fig)\r\n    axs = [fig.add_subplot(gs[x]) for x in range(1, 5)] \r\n    fig.text(0.5, 0.5, file, fontsize=25)\r\n    fig.savefig(file)\r\n    plt.close(fig)\r\n\r\nif __name__ == '__main__':\r\n    for i in range(0, 110):\r\n        file_name = f'{i}.png'\r\n        figure_bug(file_name)\r\n        print(f'Done {i}')\r\n```\r\n\r\n**Actual outcome**\r\n```\r\nAttributeError Traceback (most recent call last)\r\nD:\\...\\img_test\\layou_test.py in \u003cmodule\u003e()\r\n     14     for i in range(0, 110):\r\n     15         file_name = f'{i}.png'\r\n---\u003e 16         figure_bug(file_name)\r\n     17         print(f'Done {i}')\r\n\r\nD:\\....\\img_test\\layou_test.py in gridspec_bug(file)\r\n      8     axs = [fig.add_subplot(gs[x]) for x in range(1, 5)]\r\n      9     fig.text(0.5, 0.5, file, fontsize=25)\r\n---\u003e 10     fig.savefig(file)\r\n     11     plt.close(fig)\r\n     12\r\n\r\nC:\\....\\matplotlib\\figure.py in savefig(self, fname, frameon, transparent, **kwargs)\r\n   2095             self.set_frameon(frameon)\r\n   2096\r\n-\u003e 2097         self.canvas.print_figure(fname, **kwargs)\r\n   2098\r\n   2099         if frameon:\r\n\r\nAttributeError: 'NoneType' object has no attribute 'print_figure'\r\n```\r\n\r\n**Expected outcome**\r\nSaved image\r\n\r\n**Matplotlib version**\r\n  * Operating system: Windows\r\n  * Matplotlib version: 3.0.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.6.5\r\n  * Jupyter version (if applicable): NA\r\n  * Other libraries: NA\r\n\r\n","author":{"url":"https://github.com/abbazs","@type":"Person","name":"abbazs"},"datePublished":"2018-10-08T18:02:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/12447/matplotlib/issues/12447"}