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| == Gaps between Jython and Django == [http://pipes.yahoo.com/pipes/pipe.info?_id=jroxOD1f3BGgvtiIqGIyXQ RSS Aggregator for blog posts about Django on Jython] To run Django on Jython, with a PostgreSQL backend, the following steps are necessary: * Use the [https://jython.svn.sourceforge.net/svnroot/jython/branches/modern/ Modern branch] of Jython. This consolidated the bugs, workarounds, and patches found below -- plus a bunch more -- in a stable, almost-ready-to-be-merged-into-trunk version of Jython. The most important aspect is that we have tried to make Jython conform more to CPython, using Django as our guide, although there are some gaps - especially if Django already had incorporated fixes. Our driving goal is to converge on these gaps over time. * Use the Django trunk (tested with rev 6992, later should be OK too). * Apply these two patches, [https://jython.svn.sourceforge.net/svnroot/jython/trunk/sandbox/jbaker/django/dispatch/robustapply.py django.dispatch.robustapply] ([https://hg.leosoto.com/django.jythonport/rev/bb2b9048ed14f72e99c5c133c7ecaaeb0a5c425c diff]) and [https://jython.svn.sourceforge.net/svnroot/jython/trunk/sandbox/jbaker/django/views/debug.py django.views.debug] ([https://hg.leosoto.com/django.jythonport/rev/663bcf5efc31409899fcdc10009bc92df3e1f6b9 diff]) due to Leo Soto. These should be in Django trunk soon. * Copy these three files from CPythonLib to Lib: gettext.py, locale.py, optparse.py. Please note that these files are only partially working on Jython, that's why they haven't been promoted yet (gettext.py actually works, as verified by test_gettext.py, but depends on still failing locale.py). But they are very close, and they appear to be fine for Django. Certainly fine for this round of development! * Use the backend [https://jython.svn.sourceforge.net/svnroot/jython/trunk/sandbox/jbaker/django/db/backends/postgresql_zxjdbc/ zxjdbc_postgresql], which was contributed by Leo Soto. Here's what works: syncdb and the very cool Django admin run; many unit tests pass. You can run with internationalization enabled. You do need to run the dev server with --noreload for now. We need to document here how to run with [http://www.xhaus.com/modjy/ modjy], which is Alan Kennedy's servlet container for WSGI apps. In running the model unit tests, here are the things we seem to be missing, accounting for most of the approximately 75 failures: * Many doctests are fragile, because they depend on the dict traversal ordering; in Jython, this is different that CPython, and if we adopt !ConcurrentHashMap, it's not even repeatable. This is a pervasive bug in Django. * We still have some encoding problems, again seen in doctests. An example where output is expected to be lower case hex, not upper case. I fixed the problem in !PyUnicode, but there are more places. * Problem with the !ManagerDescriptor handling, in django.db.models.manager. * No decorators yet! (But they are coming soon, even available experimentally for Jython.) There may be some other rough categories, we need to look at the failures more systematically. All that doctest noise is certainly annoying! === Former Major problems === (Preserved to show how much we had to go through...) * Jython does not support non-str keys in {{{__dict__}}} right now. Jim Baker replaced the custom dictionary in {{{PyStringMap}}} with a {{{HashMap}}} (along Groves' earlier work). This change should resolve this problem. Try the [https://jython.svn.sourceforge.net/svnroot/jython/branches/modern/ modern] branch. Problem encountered in {{{django/utils/_threading_local.py}}}. * Something goes wrong with {{{re.compile(u"([\u0080-\uffff])")}}} in {{{django/utils/text.py}}} I think it is a lacking in our array implementation but this needs more investigation. * See [http://sourceforge.net/tracker/index.php?func=detail&aid=1544953&group_id=12867&atid=112867 bug 1544953] * {{{django/views/debug.py}}} wants to know a function's {{{__module__}}}. functions don't have a {{{__module__}}} attribute in jython yet. [http://sourceforge.net/tracker/index.php?func=detail&aid=1800472&group_id=12867&atid=312867 patch] * {{{inspect.getargs()}}} doesn't work. * That's because {{{co_code}}} isn't supported by {{{PyTableCode}}}. * '''But''', {{{co_code}}} is used by {{{getargs()}}} only to discover anonymous tuple arguments. Commenting such section seems to be enough to get the other cases working. * workaround [https://dev.archer.edu.au/projects/kepler/svn/jython-django/trunk/jython-patches/co_code-workaround.patch patch]. just sets {{{co_code = ""}}}. i haven't come across any problems for this inside django yet, but i'm sure it'll break other python code -- TristanKing * {{{time}}} module lacks {{{strptime()}}}. * workaround [https://dev.archer.edu.au/projects/kepler/svn/jython-django/trunk/jython-patches/time-strptime.patch patch]. this is incomplete, untested, and not optimal but works for the django tutorial -- TristanKing * inspect.isclass(time) shouldn't return True [http://sourceforge.net/tracker/index.php?func=detail&aid=1786009&group_id=12867&atid=112867 bug] * Django [http://code.djangoproject.com/changeset/6194 works around this] until it's fixed. === Former Minor annoyances === * slice should be a type, not a function. [http://sourceforge.net/tracker/index.php?func=detail&aid=1791931&group_id=12867&atid=112867 bug] [http://sourceforge.net/tracker/index.php?func=detail&aid=1798544&group_id=12867&atid=312867 patch] * {{{PyBoolean.__tojava__}}} returns an {{{Integer}}} * It affects zxJDBC unless a DataHandler sets the right type of boolean parameters. Fortunately, JDBC30DataHandler does this thing, at least on my limited tests -- LeonardoSoto * Jython does not have {{{__builtins__}}} as a module. Django adds "_" as a convenience method for calling gettext in {{{django/conf/__init__.py}}}. * According to the Python docs, {{{__builtins__}}} is a implementation detail and shouldn't be used by portable applications, so it's a Django problem. (See note about {{{__builtins__}}} here: http://docs.python.org/ref/naming.html) * Jython methods are not descriptors. It seems a implementation detail. [http://code.djangoproject.com/ticket/5664 django patch] * Jython classes which extend dict cannot be compared to a dict. [https://sourceforge.net/tracker/index.php?func=detail&aid=1804011&group_id=12867&atid=112867 bug] [https://dev.archer.edu.au/projects/kepler/changeset/149?format=diff&new=149 django patch] * Jython doesn't recognize {{{__unicode__}}} methods assigned to instances. * But, this is the only {{{__*__}}} method where CPython allows this, and it's not documented anywhere. So, it's a implementation detail and should be fixed on Django. [http://code.djangoproject.com/ticket/5560 django patch] === Already Fixed === (And many more!) * Jython does not have {{{sys.stdout.isatty}}}. Jython should get added to the exclusions around that call in {{{django/core/management.py}}} (win32 and 'Pocket PC' are already excluded). * Fixed in [http://code.djangoproject.com/changeset/6032 Django changeset 6032] * stringmap (or the {{{__dict__}}} implementation) needs a {{{pop(o)}}} method. * Jython lists and tuples don't have {{{__iter__}}} . * Fixed in [http://code.djangoproject.com/changeset/6211 Django changeset 6211] * Jython does not have {{{os.getpid()}}}. * Django workarounds it now. * Jython does not have {{{os.W_OK}}} needed in {{{django/core/management.py}}}. This probably will not be hard to add this since {{{java.io.File}}} has a {{{canWrite()}}}. * {{{os.chmod}}} should be implemented too (After checking for write permissions, Django will try to change them if necessary). * That's hard. Maybe Django shouldn't check for permissions if running on Jython. * Django don't check or change file permissions when running on Jython now * The {{{U}}} (Universal newlines) flag for {{{open()}}} isn't recognized on Jython * Unicode string interpolation doesn't work * {{{object}}} has a {{{__unicode__}}} attribute (it doesn't on CPython) [https://sourceforge.net/tracker/?func=detail&atid=112867&aid=1800378&group_id=12867 bug] [https://sourceforge.net/tracker/?func=detail&atid=312867&aid=1800381&group_id=12867 patch] -- TristanKing * metaclasses need to know the {{{__module__}}} of its classes [http://sourceforge.net/tracker/index.php?func=detail&aid=1781500&group_id=12867&atid=112867 bug] [http://sourceforge.net/tracker/index.php?func=detail&aid=1789137&group_id=12867&atid=312867 patch] |
My name is Veronica and I am studying Nutritional Sciences and Hotel Administration at Sant'anna / Italy. |
My name is Veronica and I am studying Nutritional Sciences and Hotel Administration at Sant'anna / Italy.