gh-140123: Make ElementTree.find use registered global namespaces

ElementTree.find, findall, findtext, and iterfind now use the
global _namespace_map as fallback when no namespaces argument
is provided. Fixes inconsistencies between ElementTree and
ElementPath when using ET.register_namespace.

Author: sangampaudel530

Lib/test/test_xml_etree.py

@@ -21,6 +21,7 @@
 import unittest.mock as mock
 import warnings
 import weakref
+import xml.etree.ElementTree as ET
 
 from contextlib import nullcontext
 from functools import partial
@@ -32,7 +33,6 @@
 from test.support.import_helper import import_fresh_module
 from test.support.os_helper import TESTFN
 
-
 # pyET is the pure-Python implementation.
 #
 # ET is pyET in test_xml_etree and is the C accelerated version in
@@ -4668,6 +4668,34 @@ def cleanup():
         old_factories = ET._set_factories(ET.Comment, ET.PI)
         unittest.addModuleCleanup(ET._set_factories, *old_factories)
 
+class TestElementTreeGlobalNamespace(unittest.TestCase):
+    def test_find_uses_registered_namespace(self):
+        xml_data = """<root>
+          <h:title xmlns:h="http://www.w3.org/TR/html4/">
+            <h:tr><h:td>Apple</h:td></h:tr>
+          </h:title>
+        </root>"""
+        ET.register_namespace("h", "http://www.w3.org/TR/html4/")
+        tree = ET.ElementTree(ET.fromstring(xml_data))
+
+        # should work without passing namespaces explicitly
+        elem = tree.find(".//h:title")
+        self.assertIsNotNone(elem)
+        self.assertEqual(elem.tag, "{http://www.w3.org/TR/html4/}title")
+
+    def test_findall_and_findtext_with_global_ns(self):
+        xml_data = """<root xmlns:h="http://www.w3.org/TR/html4/">
+            <h:item>Apple</h:item>
+            <h:item>Banana</h:item>
+        </root>"""
+        ET.register_namespace("h", "http://www.w3.org/TR/html4/")
+        root = ET.fromstring(xml_data)
+
+        items = root.findall(".//h:item")
+        self.assertEqual(len(items), 2)
+
+        first_text = root.findtext(".//h:item")
+        self.assertEqual(first_text, "Apple")
 
 if __name__ == '__main__':
     unittest.main()

Lib/xml/etree/ElementTree.py

@@ -102,6 +102,7 @@
 import weakref
 
 from . import ElementPath
+import xml.etree.ElementTree as _ET
 
 
 class ParseError(SyntaxError):
@@ -282,6 +283,8 @@ def find(self, path, namespaces=None):
         Return the first matching element, or None if no element was found.
 
         """
+        if namespaces is None:
+            namespaces = {v: k for k, v in _ET._namespace_map.items() if v}
         return ElementPath.find(self, path, namespaces)
 
     def findtext(self, path, default=None, namespaces=None):
@@ -296,6 +299,8 @@ def findtext(self, path, default=None, namespaces=None):
         content, the empty string is returned.
 
         """
+        if namespaces is None:
+            namespaces = {v: k for k, v in _ET._namespace_map.items() if v}
         return ElementPath.findtext(self, path, default, namespaces)
 
     def findall(self, path, namespaces=None):
@@ -307,6 +312,8 @@ def findall(self, path, namespaces=None):
         Returns list containing all matching elements in document order.
 
         """
+        if namespaces is None:
+            namespaces = {v: k for k, v in _ET._namespace_map.items() if v}
         return ElementPath.findall(self, path, namespaces)
 
     def iterfind(self, path, namespaces=None):
@@ -318,6 +325,8 @@ def iterfind(self, path, namespaces=None):
         Return an iterable yielding all matching elements in document order.
 
         """
+        if namespaces is None:
+            namespaces = {v: k for k, v in _ET._namespace_map.items() if v}
         return ElementPath.iterfind(self, path, namespaces)
 
     def clear(self):