Diff for "DjangoOnJython"

Gaps between Jython and Django

Major problems

• Jython does not support non-str keys in __dict__ right now. If Groves' HashMap replacement works out maybe this issue will disappear. Problem encountered in django/utils/_threading_local.py.

• Unicode string interpolation doesn't work in the general case. [http://sourceforge.net/tracker/index.php?func=detail&aid=1799328&group_id=12867&atid=112867 bug] [http://sourceforge.net/tracker/index.php?func=detail&aid=1799330&group_id=12867&atid=312867 patch]

  • There is also a problem with the algorithm deciding whether to call __str__ or __unicode__. More research is needed, but it affects the lazy string evaluation on which the Django i18n system relies (django/utils/functional.py).

    • I found that object.__unicode__ doesn't exist in CPython, and if it's removed from jython this works as expected. [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

• 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]

• 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]

• 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

• The U (Universal newlines) flag for open() isn't recognized on Jython

• 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.

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. [https://hg.leosoto.com/django.jythonport/diff/50371f2df15a/django/dispatch/saferef.py Here] is the relevant code and a potential fix from the Django side.

Already Fixed

• 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 tries to check or change file permissions when running on Jython now