Based on report and initial patch from Germán M. Bravo

Patch by Antoine Pitrou (based on Robin Schreiber's original patch)

CID 719637

handler if a Python exception is set

* Use Py_DECREF() instead of PyObject_GC_Del() to release correctly all
  resources
* Raise MemoryError on memory allocation failure

allocation failure

 * create_new_element() initializes all attributes before handling errors,
   to fix a crash in the destructor
* create_new_element() calls PyObject_GC_Del() on error, instead of
  PyObject_Del(), because the object was created by PyObject_GC_New()
* subelement() now handles create_new_element() failure
* element_getattro() now handles element_get_text() failure
* makeuniversal() now handles PyBytes_FromStringAndSize() failure

This affects pyexpat and _elementtree. PyExpat_CAPI now exposes a new
function - DefaultUnknownEncodingHandler.

Based on a patch by Serhiy Storchaka.

an internal XML encoding is UTF-8 or US-ASCII.

Based on report and patch by Aaron Oakley.

This caused an exception to be raised later than expected.

is imported. Instead, ElementTree.parse can look for a special internal method
defined by the accelerator.

Also clean up some code around this

Patch by Jonas Wagner

Also remove unused macro.

Issue #16922: fixed findtext() to return empty Unicode string instead of empty bytes object when there's no text.

Patch by Serhiy Storchaka.

Issue #16922: fixed findtext() to return empty Unicode string instead of empty bytes object when there's no text.

Patch by Serhiy Storchaka.

Coverity report) and cleanup code.

Thanks to Ezio Melotti and Daniel Shahaf for the patch.

Patch by Serhiy Storchaka

with the Python version of the class.

Patch by Daniel Shahaf.

In conformance with the documentation and the Python version.
Patch by Franck Michea.

Issue #16089: Allow ElementTree.TreeBuilder to work again with a non-Element element_factory (fixes a regression in SimpleTAL).

Issue #15144: Fix possible integer overflow when handling pointers as integer values, by using Py_uintptr_t instead of size_t.
Patch by Serhiy Storchaka.

ISsue #14988: restore Python 2's behavior of raising ImportError when unable to load pyexpat, instead of a SystemError/RuntimeError