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Fix IndexError for pyplot.legend() when plotting empty bar chart with label #13551

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Merged
jklymak merged 3 commits into from
Mar 2, 2019
Merged

Fix IndexError for pyplot.legend() when plotting empty bar chart with label #13551

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39ae61a
FIX: legend crashes when bar chart is empty with label
choyiny Feb 28, 2019
33d8f8e
add test with generating legend with empty bar chart
choyiny Mar 2, 2019
528bb02
remove image_comparison from legend test case
choyiny Mar 2, 2019
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4 changes: 3 additions & 1 deletion lib/matplotlib/legend_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,9 @@ def legend_artist(self, legend, orig_handle, fontsize, handlebox)


def update_from_first_child(tgt, src):
tgt.update_from(src.get_children()[0])
first_child = next(iter(src.get_children()), None)
if first_child is not None:
tgt.update_from(first_child)


class HandlerBase(object):
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8 changes: 8 additions & 0 deletions lib/matplotlib/tests/test_legend.py
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Expand Up @@ -477,6 +477,14 @@ def test_handler_numpoints():
ax.legend(numpoints=0.5)


def test_empty_bar_chart_with_legend():
"""Test legend when bar chart is empty with a label."""
# related to issue #13003. Calling plt.legend() should not
# raise an IndexError.
plt.bar([], [], label='test')
plt.legend()


def test_shadow_framealpha():
# Test if framealpha is activated when shadow is True
# and framealpha is not explicitly passed'''
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