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Raises ValueError on unequal lengths of labels and handles input #24063

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Raises ValueError on unequal lengths of labels and handles input #24063

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6a25122
verifying that the inputs are of a consistent length in _parse_legend…
grgkaran03 Oct 1, 2022
f61fed4
verify consistency of length of handles and labels
grgkaran03 Oct 1, 2022
9719a9a
verify length consistancy
grgkaran03 Oct 1, 2022
c628028
add test to check for raised exception.
grgkaran03 Oct 1, 2022
1397a86
test for error raised
grgkaran03 Oct 1, 2022
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4 changes: 4 additions & 0 deletions lib/matplotlib/legend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1261,6 +1261,10 @@ def _parse_legend_args(axs, *args, handles=None, labels=None, **kwargs):
handles, labels = args[:2]
extra_args = args[2:]

# Check length of handles and labels is consistent
elif len(handles) != len(labels):
raise ValueError("Number of handles not equal "
"to number of labels.")
else:
raise TypeError('Invalid arguments to legend.')

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8 changes: 8 additions & 0 deletions lib/matplotlib/tests/test_legend.py
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Expand Up @@ -970,3 +970,11 @@ def test_ncol_ncols(fig_test, fig_ref):
ncols = 3
fig_test.legend(strings, ncol=ncols)
fig_ref.legend(strings, ncols=ncols)


def test_handles_labels_length(self):
l1 = plt.plot(range(10))
l2 = plt.plot(range(11))
with pytest.raises(ValueError, match="Number of handles not equal "
"to number of labels."):
plt.legend([l1, l2], ['l1', 'l2', 'l3'])
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