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Fix pzmap grid (matplotlib angle_helper) by bnavigator · Pull Request #456 · python-control/python-control

Traceback (most recent call last):
959  File "pvtol-nested.py", line 169, in <module>
960    P, Z = pzmap(T, plot=True, grid=True)
961  File "/home/travis/build/python-control/python-control/control/pzmap.py", line 106, in pzmap
962    ax, fig = sgrid()
963  File "/home/travis/build/python-control/python-control/control/grid.py", line 82, in sgrid
964    ax.axis["wnxneg"] = axis = ax.new_floating_axis(0, 180)
965  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/axislines.py", line 575, in new_floating_axis
966    axes=self)
967  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py", line 350, in new_floating_axis
968    axisline = AxisArtist(axes, _helper)
969  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/axis_artist.py", line 746, in __init__
970    self._init_line()
971  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/axis_artist.py", line 887, in _init_line
972    self._axis_artist_helper.get_line(self.axes),
973  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py", line 270, in get_line
974    self.update_lim(axes)
975  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py", line 101, in update_lim
976    self.grid_helper.update_lim(axes)
977  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/axislines.py", line 327, in update_lim
978    self._update(x1, x2, y1, y2)
979  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py", line 319, in _update
980    self._update_grid(x1, y1, x2, y2)
981  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py", line 367, in _update_grid
982    self.grid_info = self.grid_finder.get_grid_info(x1, y1, x2, y2)
983  File "/home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/mpl_toolkits/axisartist/grid_finder.py", line 104, in get_grid_info
984    extremes = self.extreme_finder(self.inv_transform_xy, x1, y1, x2, y2)
985  File "/home/travis/build/python-control/python-control/control/grid.py", line 44, in __call__
986    self._adjust_extremes(lon_min, lon_max, lat_min, lat_max)
987AttributeError: 'ModifiedExtremeFinderCycle' object has no attribute '_adjust_extremes'

Apparently Matplotlib removed the private function _adjust_extremes between 3.2 and 3.3 (I could not find the commit yet. Clicking blame on github doesn't work. Their git history is weird).

The specific branch of pzmap and this portion of grid.py are not covered by the unit tests. Hence it was not discovered until now, when conda updated matplotlib and it fails in the pvtol-nested.pyexample.