[Python-bugs-list] [ python-Bugs-523020 ] pickle/cPickle Inconsistent EOF handling

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Bugs item #523020, was opened at 2002-02-26 16:33
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=523020&group_id=5470

Category: Python Library
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Thomas W. Christopger (tchristopher)
Assigned to: Nobody/Anonymous (nobody)
Summary: pickle/cPickle Inconsistent EOF handling

Initial Comment:
cPickle.Unpickler(f).load() and cPickle.load() do not 
handle EOF the way pickle.Unpickler(f).load(f), 
cPickle.loads(s) and pickle.loads(s) do. The first two 
give
  cPickle.UnpicklingError: invalid load key, ' '.
on EOF. The actual message text is 
"invalid load key, '\000'."
The remaining give
  EOFError

(The EOFError from all of them is what I need.)

Observe:

>>> pickle.loads('')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Python22\lib\pickle.py", line 981, in loads
    return Unpickler(file).load()
  File "C:\Python22\lib\pickle.py", line 592, in load
    dispatch[key](self)
  File "C:\Python22\lib\pickle.py", line 606, in 
load_eof
    raise EOFError
EOFError
>>> cPickle.loads('')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
EOFError

>>> class C:
...     def read(self,n): return ''
...     def readline(self): return ''
...
>>> p=pickle.Unpickler(C())
>>> p.load()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Python22\lib\pickle.py", line 592, in load
    dispatch[key](self)
  File "C:\Python22\lib\pickle.py", line 606, in 
load_eof
    raise EOFError
EOFError
>>> pickle.load(C())
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Python22\lib\pickle.py", line 977, in load
    return Unpickler(file).load()
  File "C:\Python22\lib\pickle.py", line 592, in load
    dispatch[key](self)
  File "C:\Python22\lib\pickle.py", line 606, in 
load_eof
    raise EOFError
EOFError

>>> p=cPickle.Unpickler(C())
>>> p.load()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
cPickle.UnpicklingError: invalid load key, ' '.
>>> cPickle.load(C())
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
cPickle.UnpicklingError: invalid load key, ' '.



----------------------------------------------------------------------

>Comment By: Neil Schemenauer (nascheme)
Date: 2002-03-22 23:03

Message:
Logged In: YES 
user_id=35752

Fixed in cPickle.c 2.75.

----------------------------------------------------------------------

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