shelve crashing under Win ME

gluckj at gmail.com gluckj at gmail.com
Sat Jun 30 10:52:15 CEST 2007


Hi,

I'm not a Win ME fan myself (I'm a Mac user), but I'm here in Thailand
developing software for special-needs kids, and the test PC in my home
office is a Win ME machine (sigh). So when I ported my Python program
today to the PC, it quickly crashed. Everything seems to work except
for shelve. Using the latest version of Python (2.5.1), when I do the
following in IDLE on the Win ME machine here's the result:

Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC
v.1310 32 bit (Intel)] on win32
IDLE 1.2.1
>>> import shelve
>>> f=shelve.open("foo")

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    f=shelve.open("foo")
  File "C:\PYTHON25\lib\shelve.py", line 225, in open
    return DbfilenameShelf(filename, flag, protocol,
writeback)
  File "C:\PYTHON25\lib\shelve.py", line 209, in
__init__
    Shelf.__init__(self, anydbm.open(filename, flag),
protocol, writeback)
  File "C:\PYTHON25\lib\anydbm.py", line 83, in open
    return mod.open(file, flag, mode)
  File "C:\PYTHON25\lib\dbhash.py", line 16, in open
    return bsddb.hashopen(file, flag, mode)
  File "C:\PYTHON25\lib\bsddb\__init__.py", line 306,
in hashopen
    d.open(file, db.DB_HASH, flags, mode)
DBError: (5, 'Input/output error')
>>>

For those who know shelve, this should actually run fine (if the file
"foo" does not exist it should create it). Printing the value of "f"
should show an empty dictionary {}.

It does run fine on my iBook (under Python 2.4.4) and on my iBook's
Virtual PC running Win XP & Python 2.5.0. I do not think this is a
Python 2.5.1 problem, because my first attempt to run my program on
the Win ME machine was with a version of the program I ported using
Py2exe on the VPC under Python 2.5.0, and it crashed the same way when
run on the Win ME machine (I subsequently installed Python on the Win
ME PC to try to get to the root of the problem.)

Help! How do I get Win ME (or at least the misbehaving Win ME machine
in my office) to run shelve? (or more specifically run bsddb's
hashopen?)

Or should I trash shelve entirely and rewrite all my code to use a
simpler, homemade database scheme?

Thanks for any advice!

Warmly,
Joel
joelgluck at yahoo.com




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