acct_mgr-0.4dev breaking 2.4 compatibility

[Jun Omae]

I tried acct_mgr-0.4dev on Python 2.4. I got the following error and cannot extract messages. It seems breaking 2.4 compatibility. It works well to me with acct_mgr-0.4dev-r12103_2.4compat.diff​.

$ ~/venv/trac-0.12/bin/python -V
Python 2.4.3
$ ~/venv/trac-0.12/bin/python setup.py extract_messages
running extract_messages
extracting messages from acct_mgr/__init__.py
extracting messages from acct_mgr/admin.py
extracting messages from acct_mgr/api.py
...
extracting messages from acct_mgr/templates/user_table.html
Traceback (most recent call last):
  File "setup.py", line 52, in ?
    entry_points = {
  File "/usr/lib/python2.4/distutils/core.py", line 149, in setup
    dist.run_commands()
  File "/usr/lib/python2.4/distutils/dist.py", line 946, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python2.4/distutils/dist.py", line 966, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.4/site-packages/usr/lib/python2.4/site-packages/babel/messages/frontend.py", line 313, in run
  File "/usr/lib/python2.4/site-packages/usr/lib/python2.4/site-packages/babel/messages/extract.py", line 170, in extract_from_dir
  File "/usr/lib/python2.4/site-packages/usr/lib/python2.4/site-packages/babel/messages/extract.py", line 201, in extract_from_file
  File "/usr/lib/python2.4/site-packages/usr/lib/python2.4/site-packages/babel/messages/extract.py", line 275, in extract
  File "/usr/lib/python2.4/site-packages/genshi/filters/i18n.py", line 1237, in extract
    for message in translator.extract(tmpl.stream, gettext_functions=keywords):
  File "/usr/lib/python2.4/site-packages/genshi/template/base.py", line 442, in stream
    self._stream = list(self._prepare(self._stream))
  File "/usr/lib/python2.4/site-packages/genshi/template/base.py", line 478, in _prepare
    yield kind, (directives, list(substream)), pos
  File "/usr/lib/python2.4/site-packages/genshi/template/base.py", line 478, in _prepare
    yield kind, (directives, list(substream)), pos
  File "/usr/lib/python2.4/site-packages/genshi/template/base.py", line 473, in _prepare
    namespaces, pos)
  File "/usr/lib/python2.4/site-packages/genshi/template/directives.py", line 711, in attach
    namespaces, pos)
  File "/usr/lib/python2.4/site-packages/genshi/template/directives.py", line 83, in attach
    return cls(value, template, namespaces, *pos[1:]), stream
  File "/usr/lib/python2.4/site-packages/genshi/template/directives.py", line 704, in __init__
    offset + (err.offset or 0))
genshi.template.base.TemplateSyntaxError: invalid syntax in expression "odd_even = 'odd' if idx % 2 else 'even'" of "with" directive (/home/jun66j5/src/trac/trac-hacks/accountmanagerplugin/trunk/acct_mgr/templates/user_table.html, line 28)

[Steffen Hoffmann]

Thanks for the report. Sure, my change in [10738] introduced Python2.5 idioms.

What I like most is your suggestion for oddeven, nice. I don't get the idea behind adding yet another try.. level into acct_mgr/register.py - please explain that. Thanks for taking care.

[Jun Omae]

Replying to hasienda:

I don't get the idea behind adding yet another try.. level into acct_mgr/register.py - please explain that.

Sorry for the lack of explanation.

We cannot combine both except and finally blocks on Python 2.4. ​http://docs.python.org/whatsnew/2.5.html#pep-341-unified-try-except-finally

$ python2.4
Python 2.4.3 (#1, Jun 18 2012, 08:55:31)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-52)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> try:
...   pass
... except:
...   pass
... finally:
  File "<stdin>", line 5
    finally:
          ^
SyntaxError: invalid syntax
>>>

$ python2.5
Python 2.5.6 (r256:88840, Feb 29 2012, 04:03:24)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-51)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> try:
...   pass
... except:
...   pass
... finally:
...   pass
...
>>>

[Steffen Hoffmann]

(In [12104]) AccountManagerPlugin: Replace more current coding style for Python2.4 compatibility, refs #10412.

Many thanks for Jun Omae's report, suggested fix and explanation on the issue. Nevertheless with Trac-1.1dev about to drop even Python2.5 compatibility the days of Python2.4 are counted - even in Trac plugins.

[Steffen Hoffmann]

Thanks for the explanation.

I understand, but can't reproduce anymore after upgrading my development system to Debian 6. Minimum Python version is 2.5 in there, but I guess I'll be forced to install a private 2.4 again in a virtual env, if such issues recur more often.

[Ryan J Ollos]

Replying to hasienda:

I understand, but can't reproduce anymore after upgrading my development system to Debian 6. Minimum Python version is 2.5 in there, but I guess I'll be forced to install a private 2.4 again in a virtual env, if such issues recur more often.

Same problem for me, being on Debian 6 also. If you find a package source for 2.4, I'd be interested to know.

[Steffen Hoffmann]

(In [12398]) AccountManagerPlugin: Releasing version 0.4, pushing development to acct_mgr-0.5dev.

Availability of that code as stable release closes #874, #3459, #4677, #5295, #5691, #6616, #7577, #8076, #8685, #8770, #8791, #8990, #9052, #9079, #9090, #9139, #9246, #9252, #9547, #9618, #9676, #9843, #9852, #9940, #10023, #10028, #10123, #10142, #10204, #10276, #10397, #10412, #10594, #10625 and #10644.

Some more issues have been worked-on, yet without confirmed resolution, refs #5464 (for JiraToTracIntegration), #8927 and #10134.

And finally there are some issues and enhancement requests showing progress, but known to require more work to resolve them satisfactorily, refs #843, #1600, #5964, #8217, #8933.

Thanks to all contributors and followers, that enabled and encouraged a good portion of this development work.