diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index 400063b05fab..b06e23eca9ec 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -395,15 +395,16 @@ def _grab_next_args(self, *args, **kwargs):
yield from self._plot_args(this, kwargs)
+_shared_x_axes = cbook.Grouper()
+_shared_y_axes = cbook.Grouper()
+_twinned_axes = cbook.Grouper()
+
+
class _AxesBase(martist.Artist):
"""
"""
name = "rectilinear"
- _shared_x_axes = cbook.Grouper()
- _shared_y_axes = cbook.Grouper()
- _twinned_axes = cbook.Grouper()
-
def __str__(self):
return "{0}({1[0]:g},{1[1]:g};{1[2]:g}x{1[3]:g})".format(
type(self).__name__, self._position.bounds)
@@ -468,6 +469,13 @@ def __init__(self, fig, rect,
""" % {'scale': ' | '.join(
[repr(x) for x in mscale.get_scale_names()])}
martist.Artist.__init__(self)
+
+ # Reference the global instances in the instance dict to support
+ # pickling.
+ self._shared_x_axes = _shared_x_axes
+ self._shared_y_axes = _shared_y_axes
+ self._twinned_axes = _twinned_axes
+
if isinstance(rect, mtransforms.Bbox):
self._position = rect
else:
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
index 2f405b5cc7f4..537145266d78 100644
--- a/lib/matplotlib/cbook/__init__.py
+++ b/lib/matplotlib/cbook/__init__.py
@@ -981,6 +981,25 @@ class Grouper(object):
def __init__(self, init=()):
self._mapping = {ref(x): [ref(x)] for x in init}
+ def __getstate__(self):
+ mapping = {}
+ for k, vs in self._mapping.items():
+ k = k()
+ if k is None:
+ continue
+ mapping[k] = l = []
+ for v in vs:
+ v = v()
+ if v is None:
+ continue
+ l.append(v)
+ return {"_mapping": mapping}
+
+ def __setstate__(self, state):
+ self.__dict__ = state
+ self._mapping = {ref(k): [ref(v) for v in vs]
+ for k, vs in self._mapping.items()}
+
def __contains__(self, item):
return ref(item) in self._mapping
diff --git a/lib/matplotlib/tests/test_pickle.py b/lib/matplotlib/tests/test_pickle.py
index e9240a118f9f..2d9e56a0ac61 100644
--- a/lib/matplotlib/tests/test_pickle.py
+++ b/lib/matplotlib/tests/test_pickle.py
@@ -187,3 +187,10 @@ def test_rrulewrapper():
except RecursionError:
print('rrulewrapper pickling test failed')
raise
+
+
+def test_shared():
+ fig, axs = plt.subplots(2, sharex=True)
+ fig = pickle.loads(pickle.dumps(fig))
+ fig.axes[0].set_xlim(10, 20)
+ assert fig.axes[1].get_xlim() == (10, 20)
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