Re: [Jython-users] Pickle Problems

[Robert W. B. <rb...@di...>]

Hello Chris,

Probably not pickle, but PyFile.  Even without pickle, the following file
is empty:

open('junk.txt', 'w').write('This is a test')

Currently, an explicit close() or flush() is required on the file. e.g.

f = open('junkpickle.txt', 'w')
pickle.dump(range(10), f)
f.close()  # or flush()

This makes the following usage a bad idea <g>

pickle.dump(range(10), open("pickle.txt", "w"))

Yes, this was not required in 2.0, but this is the scoop since 2.1a1.
Unfortuately, a search on PyFile in the checkins list doesn't return
any hits (crummy Geocrawler). However, The diff between the 2.0 and 2.1a1
PyFile is sizable. I don't know if this change in autoflushing is
intentional or not. It's worthy of a FAQ entry or a patch depending on the
answer to that.

-rb

On Wed, 29 Aug 2001, Chris Meyers wrote:
> Is there a problem with the pickle module in jython2.1a3 (or actually any of the 2.1 versions)? This program:
>
> f=open('junkpickle.txt','w')
> j=[]
> for i in range(10):
>   j.append(i)
> pickle.dump(j,f)
>
> makes the junkpickle.txt file, but nothing gets dumped to it. The same
> code works fine with jython 2.0, but doesn't work with 2.1a1 or 2.1a3.
>
> Sorry if this is an old problem, but I did a search of the mailing list
> archives and nothing showed up there, so I thought I'd ask.
>
> Thanks,
> Chris
>
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