diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
index 5b4fad44cecf..de0e810a7949 100644
--- a/lib/matplotlib/cbook/__init__.py
+++ b/lib/matplotlib/cbook/__init__.py
@@ -151,9 +151,8 @@ def h(exc):
"""
# We maintain two mappings:
- # callbacks: signal -> {cid -> callback}
- # _func_cid_map: signal -> {callback -> cid}
- # (actually, callbacks are weakrefs to the actual callbacks).
+ # callbacks: signal -> {cid -> weakref-to-callback}
+ # _func_cid_map: signal -> {weakref-to-callback -> cid}
def __init__(self, exception_handler=_exception_printer):
self.exception_handler = exception_handler
@@ -161,19 +160,9 @@ def __init__(self, exception_handler=_exception_printer):
self._cid_gen = itertools.count()
self._func_cid_map = {}
- # In general, callbacks may not be pickled; thus, we simply recreate an
- # empty dictionary at unpickling. In order to ensure that `__setstate__`
- # (which just defers to `__init__`) is called, `__getstate__` must
- # return a truthy value (for pickle protocol>=3, i.e. Py3, the
- # *actual* behavior is that `__setstate__` will be called as long as
- # `__getstate__` does not return `None`, but this is undocumented -- see
- # http://bugs.python.org/issue12290).
-
def __getstate__(self):
- return {'exception_handler': self.exception_handler}
-
- def __setstate__(self, state):
- self.__init__(**state)
+ # In general, callbacks may not be pickled, so we just drop them.
+ return {**vars(self), "callbacks": {}, "_func_cid_map": {}}
def connect(self, s, func):
"""Register *func* to be called when signal *s* is generated.
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