New submission from Arfrever Frehtes Taifersar Arahesis <arfrever....@gmail.com>:
If, after building of Python, libexpat.so (library used by pyexpat module) has been broken/removed or pyexpat module has been broken/removed, then attempt of import of _elementtree module, which requires pyexpat module, will raise strange exceptions in Python 3. These exceptions can be simulated by setting sys.modules["pyexpat"] = None. $ python2.6 -c 'import sys; sys.modules["pyexpat"] = None; import _elementtree' Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named pyexpat $ python2.7 -c 'import sys; sys.modules["pyexpat"] = None; import _elementtree' Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: PyCapsule_Import could not import module "pyexpat" $ python3.1 -c 'import sys; sys.modules["pyexpat"] = None; import _elementtree' Traceback (most recent call last): File "<string>", line 1, in <module> SystemError: initialization of _elementtree raised unreported exception $ python3.2 -c 'import sys; sys.modules["pyexpat"] = None; import _elementtree' Traceback (most recent call last): File "<string>", line 1, in <module> SystemError: initialization of _elementtree raised unreported exception $ python3.3 -c 'import sys; sys.modules["pyexpat"] = None; import _elementtree' Traceback (most recent call last): File "<string>", line 1, in <module> File "<frozen importlib._bootstrap>", line 1286, in _find_and_load File "<frozen importlib._bootstrap>", line 1253, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 432, in _check_name_wrapper File "<frozen importlib._bootstrap>", line 347, in set_package_wrapper File "<frozen importlib._bootstrap>", line 360, in set_loader_wrapper File "<frozen importlib._bootstrap>", line 870, in load_module RuntimeError: cannot load dispatch table from pyexpat I suggest to raise ImportError instead of SystemError or RuntimeError. Third-party modules would rather use only 'except ImportError: pass' instead of 'except (ImportError, SystemError, RuntimeError): pass' when trying to optionally use e.g. xml.etree.cElementTree. xml.etree.ElementTree in Python 3.3 also ignores only ImportError when trying to import _elementtree. ---------- messages: 162198 nosy: Arfrever, eli.bendersky, flox priority: normal severity: normal status: open title: _elementtree: Raise ImportError when importing of pyexpat fails versions: Python 3.2, Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue14988> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
