mpl 3.3+ unit test failures

[bjlittle]

🐛 Bug Report

PR #3762 unpinned matplotlib<3.3.

In travis-ci all our tests pass 🎉, however when you run the tests locally there are 16 failures and 32 errors

How To Reproduce

Steps to reproduce the behaviour:

1. Replicate the conda environment of a recent successful travis-ci job, e.g., see here and the Additional context section.

   > conda create --yes --quiet --name iris-issue-3821 --file=iris-issue-3821.yml

2. Activate the conda environment e.g.,

   > conda activate iris-issue-3821

3. Checkout the master branch of iris e.g.,

   > git fetch upstream
   > git checkout upstream/master

4. Develop install iris into the conda environment e.g.,

   > python setup.py develop

5. Run the minimal suite of tests i.e., no iris test data is necessary to reproduce this issue, e.g.,

   > python -m iris.tests.runner --default-tests

An example of the test failure output is provided in the Additional context.

Expected behaviour

All unit tests pass on travis-ci and locally as a developer.

Environment

• SciTools/iris latest master commit 13e8b2c

Additional context

Click to expand example conda dependencies...

@EXPLICIT
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https://conda.anaconda.org/conda-forge/linux-64/libgdal-3.1.2-hb2a6f5f_1.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.3.1-py36h5ffbc53_1.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.4-nompi_py36ha8c3e71_102.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.5.0-pyh9f0ad1d_0.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/nose-1.3.7-py36h9f0ad1d_1004.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/pango-1.42.4-h7062337_4.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/pip-20.2.2-py_0.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/pyopenssl-19.1.0-py_1.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/bokeh-2.1.1-py36_0.conda
https://conda.anaconda.org/conda-forge/linux-64/esmpy-8.0.1-mpi_mpich_py36hbf9737e_100.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/gdal-3.1.2-py36hcf62b00_1.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.42.3-h0511662_0.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.3.1-1.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.2.0-py_1.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/pyugrid-0.3.1-py_2.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/urllib3-1.25.10-py_0.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/virtualenv-20.0.20-py36h9f0ad1d_1.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/dask-2.25.0-py_0.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.7.1-py36h9f0ad1d_0.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/requests-2.24.0-pyh9f0ad1d_0.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/owslib-0.20.0-py_0.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/pyepsg-0.4.0-py_0.tar.bz2
https://conda.anaconda.org/conda-forge/linux-64/cartopy-0.18.0-py36h91e5944_2.tar.bz2

Click to expand example test failure output...

Running test suite(s): default

Running test discovery on iris.tests with 2 processors.
...
======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_contour.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contour.py", line 47, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage92"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_contour.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contour.py", line 38, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage101"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_contourf.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contourf.py", line 49, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage119"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_contourf.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contourf.py", line 40, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage128"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_outline.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_outline.py", line 39, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage146"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_outline.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_outline.py", line 49, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage155"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_pcolor.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 41, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage173"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_pcolor.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 51, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage182"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_pcolormesh.TestStringCoordPlot)Exception in Tkinter callback
Traceback (most recent call last):
  File ".../lib/python3.6/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File ".../lib/python3.6/tkinter/__init__.py", line 749, in callit
    func(*args)
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 253, in idle_draw
    self.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage2"
Exception in Tkinter callback
Traceback (most recent call last):
  File ".../lib/python3.6/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File ".../lib/python3.6/tkinter/__init__.py", line 749, in callit
    func(*args)
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 253, in idle_draw
    self.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage2"
...
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 41, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage209"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_pcolormesh.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 51, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage218"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_plot.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_plot.py", line 57, in test_xaxis_labels_with_axes
    self.assertBoundsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 45, in assertBoundsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage227"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_plot.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_plot.py", line 48, in test_yaxis_labels_with_axes
    self.assertBoundsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 45, in assertBoundsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage236"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_points.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_points.py", line 39, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage272"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_points.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_points.py", line 49, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage290"

======================================================================
ERROR: test_xaxis_labels_with_axes (iris.tests.unit.plot.test_scatter.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_scatter.py", line 40, in test_xaxis_labels_with_axes
    self.assertPointsTickLabels("xaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage317"

======================================================================
ERROR: test_yaxis_labels_with_axes (iris.tests.unit.plot.test_scatter.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_scatter.py", line 50, in test_yaxis_labels_with_axes
    self.assertPointsTickLabels("yaxis", ax)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 57, in assertPointsTickLabels
    actual = self.tick_loc_and_label(axis, axes)
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 34, in tick_loc_and_label
    axes.figure.canvas.draw()
  File ".../lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  File ".../lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 75, in blit
    photoimage.blank()
  File ".../lib/python3.6/tkinter/__init__.py", line 3548, in blank
    self.tk.call(self.name, 'blank')
_tkinter.TclError: invalid command name "pyimage326"

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_contour.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contour.py", line 29, in test_xaxis_labels
    self.assertPointsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_contour.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contour.py", line 25, in test_yaxis_labels
    self.assertPointsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_contourf.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contourf.py", line 31, in test_xaxis_labels
    self.assertPointsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_contourf.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_contourf.py", line 27, in test_yaxis_labels
    self.assertPointsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_outline.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_outline.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_outline.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_outline.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_pcolor.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 31, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_pcolor.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 27, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_pcolormesh.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 31, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_pcolormesh.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/_blockplot_common.py", line 27, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_plot.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_plot.py", line 39, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_plot.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_plot.py", line 35, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_points.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_points.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_points.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_points.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.plot.test_scatter.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_scatter.py", line 26, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.plot.test_scatter.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/plot/test_scatter.py", line 30, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_contour.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_contour.py", line 29, in test_xaxis_labels
    self.assertPointsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_contour.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_contour.py", line 25, in test_yaxis_labels
    self.assertPointsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_contourf.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_contourf.py", line 31, in test_xaxis_labels
    self.assertPointsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_contourf.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_contourf.py", line 27, in test_yaxis_labels
    self.assertPointsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 59, in assertPointsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')] != [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

First differing element 0:
(0.0, 'a')
(0.0, '')

- [(0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd')]
?         -           -           -           -

+ [(0.0, ''), (1.0, ''), (2.0, ''), (3.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_outline.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_outline.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_outline.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_outline.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_pcolor.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_pcolor.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_pcolor.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_pcolor.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_pcolormesh.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_pcolormesh.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_pcolormesh.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_pcolormesh.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_plot.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_plot.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_plot.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_plot.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_points.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_points.py", line 29, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_points.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_points.py", line 25, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_xaxis_labels (iris.tests.unit.quickplot.test_scatter.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_scatter.py", line 25, in test_xaxis_labels
    self.assertBoundsTickLabels("xaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

======================================================================
FAIL: test_yaxis_labels (iris.tests.unit.quickplot.test_scatter.TestStringCoordPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../iris/lib/iris/tests/unit/quickplot/test_scatter.py", line 29, in test_yaxis_labels
    self.assertBoundsTickLabels("yaxis")
  File ".../iris/lib/iris/tests/unit/plot/__init__.py", line 54, in assertBoundsTickLabels
    self.assertEqual(expected, actual)
AssertionError: Lists differ: [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')] != [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

First differing element 0:
(-1.0, 'a')
(-1.0, '')

- [(-1.0, 'a'), (0.0, 'a'), (1.0, 'b'), (2.0, 'c'), (3.0, 'd'), (4.0, '')]
?          -           -           -           -           -

+ [(-1.0, ''), (0.0, ''), (1.0, ''), (2.0, ''), (3.0, ''), (4.0, '')]

----------------------------------------------------------------------
Ran 4766 tests in 28.459s

FAILED (SKIP=857, errors=16, failures=32)

[bjlittle]

Ping @trexfeathers and @stephenworsley

[stephenworsley]

This issue in Matplotlib seems relevant to the tests failing with tkinter in the traceback matplotlib/matplotlib#17104. Notably, matplotlib/backends/_backend_tk.py", line 253, in idle_draw is mentioned in some of the tracebacks and also in this issue.

[stephenworsley]

Probably unrelated, but while looking into this I discovered that Matplotlib's IndexFormatter is now deprecated matplotlib/matplotlib#16170. In order to keep up with the latest Matplotlib version we will have to replace it with FuncFormatter as, for example, described here matplotlib/matplotlib#16631 (comment).

[bjlittle]

Closed by #3846