Bugs item #1188175, was opened at 2005-04-22 16:02
Message generated for change (Comment added) made by drhok
You can respond by visiting:
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Category: Python Library
Group: Python 2.3
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Heiko Selber (drhok)
Assigned to: Nobody/Anonymous (nobody)
Summary: Pickle with HIGHEST_PROTOCOL "ord() expected..."
Initial Comment:
A Python script that I wrote contains a tree-like data
structure that cannot be unpickled when pickled with
protocol==-1 (or 2).
I attached the smallest example I could find.
If run with pickle, the result is:
Traceback (most recent call last):
File "D:\src\misc\CDROM\python\pickletest.py", line
68, in ?
tree=load( f )
File "C:\Python23\lib\pickle.py", line 1390, in load
return Unpickler(file).load()
File "C:\Python23\lib\pickle.py", line 872, in load
dispatch[key](self)
File "C:\Python23\lib\pickle.py", line 1189, in
load_binput
i = ord(self.read(1))
TypeError: ord() expected a character, but string of
length 0 found
But with cPickle, the result is:
Traceback (most recent call last):
File "D:\src\misc\CDROM\python\pickletest.py", line
68, in ?
tree=load( f )
EOFError
Small changes in the datastructure lead to different
results: try changing the line
if level<4:
to
if level<1:
Now cPickle works, but not pickle.
This happens with Python 2.3.3 and 2.3.5 on Windows
XP.
----------------------------------------------------------------------
>Comment By: Heiko Selber (drhok)
Date: 2005-04-22 20:54
Message:
Logged In: YES
user_id=865975
Ouch! You're right, I failed to specify binary mode.
Sorry, closing.
----------------------------------------------------------------------
Comment By: Tim Peters (tim_one)
Date: 2005-04-22 17:01
Message:
Logged In: YES
user_id=31435
How did you open the file? You must open files holding
pickle data in binary mode on Windows (and should open
them in binary mode on all platforms). IOW, you must do
f = open(whatever, 'wb')
when opening a file to which you write a pickle, and must use
f = open(whatever, 'rb')
when opening a file from which you want to read a pickle.
----------------------------------------------------------------------
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