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Commitbd262e9

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Restore axes sharedness when unpickling.
Previously, pickling and unpickling shared axes would result inaxes sharing a ticker instance (because that's how shared axesare set up), but without changes of one's xlims propagated to theother. The reason is that that sharedness information is stored inAxesBase._shared_x_axes, which does *not* get pickled together with theAxes instance: the latter only has a textual reference "I am an instanceof AxesBase", so the Grouper information is lost.To keep the Grouper information valid, instead move the Groupers to theinstance dictionaries (as references to global groupers). Also makeGroupers picklable following a similar strategy as Transforms, i.e. bytransforming weakrefs into real refs when pickling and transforming themback into weakref when unpickling.
1 parente22a16a commitbd262e9

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3 files changed

+38
-4
lines changed

3 files changed

+38
-4
lines changed

‎lib/matplotlib/axes/_base.py

Lines changed: 12 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -395,15 +395,16 @@ def _grab_next_args(self, *args, **kwargs):
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yieldfromself._plot_args(this,kwargs)
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397397

398+
_shared_x_axes=cbook.Grouper()
399+
_shared_y_axes=cbook.Grouper()
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_twinned_axes=cbook.Grouper()
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402+
398403
class_AxesBase(martist.Artist):
399404
"""
400405
"""
401406
name="rectilinear"
402407

403-
_shared_x_axes=cbook.Grouper()
404-
_shared_y_axes=cbook.Grouper()
405-
_twinned_axes=cbook.Grouper()
406-
407408
def__str__(self):
408409
return"{0}({1[0]:g},{1[1]:g};{1[2]:g}x{1[3]:g})".format(
409410
type(self).__name__,self._position.bounds)
@@ -468,6 +469,13 @@ def __init__(self, fig, rect,
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"""% {'scale':' | '.join(
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[repr(x)forxinmscale.get_scale_names()])}
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martist.Artist.__init__(self)
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473+
# Reference the global instances in the instance dict to support
474+
# pickling.
475+
self._shared_x_axes=_shared_x_axes
476+
self._shared_y_axes=_shared_y_axes
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self._twinned_axes=_twinned_axes
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471479
ifisinstance(rect,mtransforms.Bbox):
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self._position=rect
473481
else:

‎lib/matplotlib/cbook/__init__.py

Lines changed: 19 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -981,6 +981,25 @@ class Grouper(object):
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def__init__(self,init=()):
982982
self._mapping= {ref(x): [ref(x)]forxininit}
983983

984+
def__getstate__(self):
985+
mapping= {}
986+
fork,vsinself._mapping.items():
987+
k=k()
988+
ifkisNone:
989+
continue
990+
mapping[k]=l= []
991+
forvinvs:
992+
v=v()
993+
ifvisNone:
994+
continue
995+
l.append(v)
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return {"_mapping":mapping}
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998+
def__setstate__(self,state):
999+
self.__dict__=state
1000+
self._mapping= {ref(k): [ref(v)forvinvs]
1001+
fork,vsinself._mapping.items()}
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9841003
def__contains__(self,item):
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returnref(item)inself._mapping
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‎lib/matplotlib/tests/test_pickle.py

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -187,3 +187,10 @@ def test_rrulewrapper():
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exceptRecursionError:
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print('rrulewrapper pickling test failed')
189189
raise
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191+
192+
deftest_shared():
193+
fig,axs=plt.subplots(2,sharex=True)
194+
fig=pickle.loads(pickle.dumps(fig))
195+
fig.axes[0].set_xlim(10,20)
196+
assertfig.axes[1].get_xlim()== (10,20)

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