Fix issue #4374: Pickle tests fail w/o _pickle extension.
Add an initialization check to mimic the interface of _pickle.
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 37c3d52..201dc99 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -222,6 +222,11 @@
def dump(self, obj):
"""Write a pickled representation of obj to the open file."""
+ # Check whether Pickler was initialized correctly. This is
+ # only needed to mimic the behavior of _pickle.Pickler.dump().
+ if not hasattr(self, "write"):
+ raise PicklingError("Pickler.__init__() was not called by "
+ "%s.__init__()" % (self.__class__.__name__,))
if self.proto >= 2:
self.write(PROTO + bytes([self.proto]))
self.save(obj)
@@ -789,6 +794,11 @@
Return the reconstituted object hierarchy specified in the file.
"""
+ # Check whether Unpickler was initialized correctly. This is
+ # only needed to mimic the behavior of _pickle.Unpickler.dump().
+ if not hasattr(self, "read"):
+ raise UnpicklingError("Unpickler.__init__() was not called by "
+ "%s.__init__()" % (self.__class__.__name__,))
self.mark = object() # any new unique object
self.stack = []
self.append = self.stack.append