Joshua M Rhoades wrote at 2005-5-13 16:44 -0700:
>Has anyone frozen scripts that use pyxml with freeze.py on unix ? I used
>py2exe for windows but am having difficulty with freeze.py on AIX.
>I'm using python 2.4.1 and pyxml 0.8.4.
>The piece of code currently causing problems is within xpath.
>The problem I am having is with it loading shared object files at run time
>via a "from" import statement. In particular, xml/utils/boolean.so.
I solved a similar problem for Zope with a "meta_path" import hook.
In my case, a shared object for a module identified by "<full_module_path>"
as the filename "<full_module_path>.so". I.e. "xml.utils.boolean"
would be in file "xml.utils.boolean.so".
Then I use the followining code to define and install
the "meta_path" hook loading such shared objects.
import sys, imp
from os import environ
from os.path import sep, pathsep
from glob import glob
# note some imports may be missing
if sys.platform == 'win32':
_SHARED_OBJECT_DESCRIPTION = ('.pyd', 'rb', 3)
else:
# ATT: not sure whether Win98 uses "win32" as platform
_SHARED_OBJECT_DESCRIPTION = ('.so', 'rb', 3)
_SHARED_OBJECT_SUFFIX = _SHARED_OBJECT_DESCRIPTION[0]
PATH = environ.get('PYPACKAGE_PATH') or None
if PATH is not None:
PATH = PATH.split(pathsep)
class _SharedObjectImporter:
'''singleton to load shared objects for use as a 'meta_hook'.'''
def __init__(self, path):
map = {}
cpath = path[:]; cpath.reverse()
for p in cpath:
prefix = p and p + sep or ''
for fn in glob(prefix + '*' + _SHARED_OBJECT_SUFFIX):
modname = fn[len(prefix):-len(_SHARED_OBJECT_SUFFIX)]
map[modname] = fn
if modname.endswith('module'):
map[modname[:-6]] = fn
self._map = map
def find_module(self, fullname, unused):
if fullname in self._map: return self
def load_module(self, fullname):
return _load(fullname, self._map[fullname])
def _load(fullname, filename):
if fullname in sys.modules: return sys.modules[fullname]
# This whole mess is necessary because Python determines
# the package context from the frame that called
# "imp.load_module" rather than the full name!
# ATT: we potentially leave a restricted environment!
desc = _SHARED_OBJECT_DESCRIPTION
load = imp.load_module
if '.' in fullname:
parent = fullname[:fullname.rindex('.')]
__import__(parent)
glbs = sys.modules[parent].__dict__
else: glbs = {'__builtins__' : __builtins__}
exec 'load(fullname, None, filename, desc)' in glbs, locals()
return sys.modules[fullname]
if PATH: sys.meta_path.insert(0, _SharedObjectImporter(PATH))
--
Dieter
_______________________________________________
XML-SIG maillist - XML-SIG@python.org
http://mail.python.org/mailman/listinfo/xml-sig
