Re: [Jython-users] Pickle Problems

[<bc...@wo...>]

[Robert W. Bill]

>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 is not intentional, but a result of the buffering (which give us a
sizable performance boost, especially for pickle) and the fact that
PyFiles isn't closed when exiting.

>It's worthy of a FAQ entry or a patch depending on the
>answer to that.

Probably both, because I don't think we can fix this problem for all
versions of java.

regards,
finn