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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot pickle `figure` or `axes` (TypeError: instancemethod)","articleBody":"Couple of issues I've found.\n\n``` python\ndef latex_float(f, pos=0):\n    float_str = \"{0:.2g}\".format(f)\n    if \"e\" in float_str:\n        base, exponent = float_str.split(\"e\")\n        return r\"${0} \\times 10^{{{1}}}$\".format(base, int(exponent))\n    else:\n        return r\"${}$\".format(float_str)\n\nformatter = FuncFormatter(latex_float)\n\ncorr = np.corrcoef(data['x'], data['y'])[0,1]\nfig, ax = pl.subplots(figsize=figsize)\nhist, _, _, im = ax.hist2d(data['x'], data['y'], norm=LogNorm(), bins=(bins_x, bins_y) , alpha=0.75, cmap = cmap)\n\ncbar = fig.colorbar(im, ticks=[0., 1., 2., 5., 10., 20., 50., 100., 200., 500., 1000., 2000., 5000.], format=formatter)\ncbar.set_label('number density', fontsize=labelsize, labelpad=79)\ncbar.ax.tick_params(labelsize=labelsize-6, width=3, length=15)\ncbar.ax.minorticks_on()\n\nax.set_xlabel(label_x, fontsize=labelsize)\nax.set_ylabel(label_y, fontsize=labelsize)\nax.grid(True, which='both', linewidth=3, linestyle='--', alpha=0.5)\nax.text(0.95, 0.05, '$\\mathrm{{Corr}} = {:0.4f}$'.format(corr), transform=ax.transAxes, fontsize=labelsize, verticalalignment='bottom', horizontalalignment='right', bbox=textprops)\n\nax.tick_params(axis='both', which='major', labelsize=labelsize-6)\n\npickle.dump(ax, file('ZH_ax.pkl', 'w+'))\n\nfig.close()\n```\n\nAs it is, the code gives the following error:\n\n```\nTraceback (most recent call last):\n  File \"make_plots_new.py\", line 124, in \u003cmodule\u003e\n    pickle.dump(fig, file('ZH_ax.pkl', 'w+'))\n  File \"/lib/python2.7/copy_reg.py\", line 70, in _reduce_ex\n    raise TypeError, \"can't pickle %s objects\" % base.__name__\nTypeError: can't pickle instancemethod objects\n```\n\nIf I exclude the label formatter function in the `colorbar`, I get an error of\n\n```\nTraceback (most recent call last):\n  File \"make_plots_new.py\", line 124, in \u003cmodule\u003e\n    pickle.dump(fig, file('ZH_ax.pkl', 'w+'))\ncPickle.UnpickleableError: Cannot pickle \u003ctype 'Image'\u003e objects\n```\n\nHow can one pickle?\n","author":{"url":"https://github.com/kratsg","@type":"Person","name":"kratsg"},"datePublished":"2014-08-21T14:34:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/3392/matplotlib/issues/3392"}