openerp-india team mailing list archive

["Olivier Dony \(OpenERP\)" <939653@xxxxxxxxxxxxxxxxxx>]

Hello,

That is quite unfortunately caused by a bug in certain Python 2.6
versions on RedHat/CentOS. OpenERP uses standard Python 2.6 features
that seem to work on all other Python 2.6 platforms.

As discussed on Launchpad answer #185679 and in the forum [1], it seems
that on affected Python 2.6 versions it is impossible to nest more than
4 "if" filters in a list comprehension expression.

The ir.model class uses a list comprehension expression with 5 nested
ifs:

  def _get_fields_type(self, cr, uid, context=None):
      return sorted([(k,k) for k,v in fields.__dict__.iteritems()
                      if type(v) == types.TypeType
                      if issubclass(v, fields._column)
                      if v != fields._column
                      if not v._deprecated
                      if not issubclass(v, fields.function)])

We could implement a workaround for CentOS in this specific case, but it does not guarantee that we will not see other similar (but less obvious) cases of this same problem, because it breaks our fundamental hypothesis of "cross-platformness" of Python!
My google skills did not reveal any obvious bug report on Fedora/CentOS/RedHat, so it would perhaps be a good idea to report this upstream and get it fixed where it should be.

One way to rewrite the above code without so many nested `if`s is to
simply replace them with `and`s:

 def _get_fields_type(self, cr, uid, context=None):
      return sorted([(k,k) for k,v in fields.__dict__.iteritems()
                      if type(v) == types.TypeType and \
                         issubclass(v, fields._column) and \
                         v != fields._column and \
                         not v._deprecated and \
                         not issubclass(v, fields.function)])


[1] http://www.openerp.com/forum/topic30304.html

** Changed in: openobject-addons
   Importance: Undecided => Low

** Changed in: openobject-addons
       Status: Invalid => Confirmed

** Changed in: openobject-addons
     Assignee: (unassigned) => OpenERP's Framework R&D (openerp-dev-framework)

** Project changed: openobject-addons => openobject-server

-- 
You received this bug notification because you are a member of OpenERP
Indian Team, which is subscribed to OpenERP Addons.
https://bugs.launchpad.net/bugs/939653

Title:
  Install / RedHat 6.2 / pip fails with InstallationError

Status in OpenERP Server:
  Confirmed

Bug description:
  This is with official 6.1 openerp downloaded here http://nightly.openerp.com/6.1/releases/openerp-6.1-1.tar.gz
  Followed the README
  The last step (# pip install .) fails with the following message:

  ...
  copying and adjusting openerp-server -> build/scripts-2.6

  changing mode of build/scripts-2.6/openerp-server from 644 to 755

  running install_lib

  byte-compiling /usr/lib/python2.6/site-
  packages/openerp/addons/base/ir/ir_model.py to ir_model.pyc

  python: Python/compile.c:3437: stackdepth_walk: Assertion `depth >= 0'
  failed.

  ----------------------------------------

  Command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-
  g0BVFR-
  build/setup.py';exec(compile(open(__file__).read().replace('\r\n',
  '\n'), __file__, 'exec'))" install --single-version-externally-managed
  --record /tmp/pip-Zjgm4Z-record/install-record.txt failed with error
  code -6 in /tmp/pip-g0BVFR-build

  Exception information:
  Traceback (most recent call last):
    File "/usr/lib/python2.6/site-packages/pip-1.1-py2.6.egg/pip/basecommand.py", line 104, in main
      status = self.run(options, args)
    File "/usr/lib/python2.6/site-packages/pip-1.1-py2.6.egg/pip/commands/install.py", line 250, in run
      requirement_set.install(install_options, global_options)
    File "/usr/lib/python2.6/site-packages/pip-1.1-py2.6.egg/pip/req.py", line 1133, in install
      requirement.install(install_options, global_options)
    File "/usr/lib/python2.6/site-packages/pip-1.1-py2.6.egg/pip/req.py", line 577, in install
      cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
    File "/usr/lib/python2.6/site-packages/pip-1.1-py2.6.egg/pip/__init__.py", line 256, in call_subprocess
      % (command_desc, proc.returncode, cwd))
  InstallationError: Command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-g0BVFR-build/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-Zjgm4Z-record/install-record.txt failed with error code -6 in /tmp/pip-g0BVFR-build

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