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FIX: (re-allow) legend OrderedDict handles and labels... #10263

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Merged
tacaswell merged 2 commits into from
Jan 17, 2018
Merged

FIX: (re-allow) legend OrderedDict handles and labels... #10263

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ba834ce
FIX: allow OrderedDict legend handles and labels
jklymak Jan 16, 2018
3d65ca1
TST: add smoketest for ordereddict legend handles
jklymak Jan 16, 2018
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19 changes: 11 additions & 8 deletions lib/matplotlib/legend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -589,14 +589,17 @@ def __init__(self, parent, handles, labels,
setattr(self, name, value)
del locals_view
# trim handles and labels if illegal label...
for label, handle in zip(labels[:], handles[:]):
if (isinstance(label, six.string_types) and
label.startswith('_')):
warnings.warn('The handle {!r} has a label of {!r} which '
'cannot be automatically added to the '
'legend.'.format(handle, label))
labels.remove(label)
handles.remove(handle)
_lab, _hand = [], []
for label, handle in zip(labels, handles):
if (isinstance(label, six.string_types) and
label.startswith('_')):
warnings.warn('The handle {!r} has a label of {!r} which '
'cannot be automatically added to the '
'legend.'.format(handle, label))
else:
_lab.append(label)
_hand.append(handle)
labels, handles = _lab, _hand

handles = list(handles)
if len(handles) < 2:
Expand Down
18 changes: 18 additions & 0 deletions lib/matplotlib/tests/test_legend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
from unittest import mock
except ImportError:
import mock
import collections
import numpy as np
import pytest

Expand Down Expand Up @@ -53,6 +54,23 @@ def test_legend_kwdocstrings():
assert stleg == stfig


def test_legend_ordereddict():
# smoketest that ordereddict inputs work...

X = np.random.randn(10)
Y = np.random.randn(10)
labels = ['a'] * 5 + ['b'] * 5
colors = ['r'] * 5 + ['g'] * 5

fig, ax = plt.subplots()
for x, y, label, color in zip(X, Y, labels, colors):
ax.scatter(x, y, label=label, c=color)

handles, labels = ax.get_legend_handles_labels()
legend = collections.OrderedDict(zip(labels, handles))
ax.legend(legend.values(), legend.keys(), loc=6, bbox_to_anchor=(1, .5))


@image_comparison(baseline_images=['legend_auto1'], remove_text=True)
def test_legend_auto1():
'Test automatic legend placement'
Expand Down