#!/usr/bin/env python3importmatplotlibmatplotlib.use('Agg')importmatplotlib.pyplotaspltfig=plt.figure()ax=fig.add_subplot(111,frameon=True)ax.plot()# If the call to draw() below is removed, everything works# However, this line cases xtick and ytick get_window_extent()# to raise 'RuntimeError: Cannot get window extent w/o renderer'# on matplotlib 2.2.0 (tested also on 2.2.2)## Moreover, this works just fine with and without the call to# draw() below, with matplotlib 2.1.2plt.get_current_fig_manager().canvas.draw()ax.set_xlabel(ax.get_xlabel()).get_window_extent()ax.set_ylabel(ax.get_ylabel()).get_window_extent()forxtickinax.get_xticklabels():xtick.get_window_extent()forytickinax.get_yticklabels():ytick.get_window_extent()

Traceback (most recent call last):  File "matplotlib-bug.py", line 22, in <module>    xtick.get_window_extent()  File "/usr/lib/python3.6/site-packages/matplotlib/text.py", line 920, in get_window_extent    raise RuntimeError('Cannot get window extent w/o renderer')RuntimeError: Cannot get window extent w/o renderer