Bugs item #1742889, was opened at 2007-06-25 14:43
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Category: None
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Jim Fulton (dcjim)
Assigned to: Nobody/Anonymous (nobody)
Summary: Pickling of exceptions broken
Initial Comment:
Exceptions with required initialization arguments can't be unpickled:
>>> class E(Exception):
... def __init__(self, x):
... self.x = x
...
>>> import pickle
>>> e = E(1)
>>> p = pickle.dumps(e, 1)
>>> pickle.loads(p)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/python/2.5.1/lib/python2.5/pickle.py", line 1374, in loads
return Unpickler(file).load()
File "/usr/local/python/2.5.1/lib/python2.5/pickle.py", line 858, in load
dispatch[key](self)
File "/usr/local/python/2.5.1/lib/python2.5/pickle.py", line 1133, in
load_reduce
value = func(*args)
TypeError: __init__() takes exactly 2 arguments (1 given)
This is because __reduce__ defined in exceptions.c returns the type and the
args variable, which an exception subclass might not populate.
Also, the reduce implementation doesn't properly serialize the message
attribute.
I assume that the need for a custom reduce is due to the micro-optimization to
store arge and message in C slots. Is this really necessary?
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