https://github.com/python/cpython/commit/e0245c789f54b63d461717a91eec8ffccbe18966
commit: e0245c789f54b63d461717a91eec8ffccbe18966
branch: main
author: Kira <kirawhoprogr...@fastmail.com>
committer: serhiy-storchaka <storch...@gmail.com>
date: 2025-07-03T10:48:47+03:00
summary:
gh-135640: Adds more type checking to ElementTree (GH-135643)
files:
A Misc/NEWS.d/next/Library/2025-06-22-02-16-17.gh-issue-135640.FXyFL6.rst
M Lib/test/test_xml_etree.py
M Lib/xml/etree/ElementTree.py
diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
index 38be2cd437f200..bf6d5074fdebd8 100644
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -218,6 +218,33 @@ class ElementTreeTest(unittest.TestCase):
def serialize_check(self, elem, expected):
self.assertEqual(serialize(elem), expected)
+ def test_constructor(self):
+ # Test constructor behavior.
+
+ with self.assertRaises(TypeError):
+ tree = ET.ElementTree("")
+ with self.assertRaises(TypeError):
+ tree = ET.ElementTree(ET.ElementTree())
+
+ def test_setroot(self):
+ # Test _setroot behavior.
+
+ tree = ET.ElementTree()
+ element = ET.Element("tag")
+ tree._setroot(element)
+ self.assertEqual(tree.getroot().tag, "tag")
+ self.assertEqual(tree.getroot(), element)
+
+ # Test behavior with an invalid root element
+
+ tree = ET.ElementTree()
+ with self.assertRaises(TypeError):
+ tree._setroot("")
+ with self.assertRaises(TypeError):
+ tree._setroot(ET.ElementTree())
+ with self.assertRaises(TypeError):
+ tree._setroot(None)
+
def test_interface(self):
# Test element tree interface.
diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index 44ab5d18624e73..dafe5b1b8a0c3f 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -527,7 +527,9 @@ class ElementTree:
"""
def __init__(self, element=None, file=None):
- # assert element is None or iselement(element)
+ if element is not None and not iselement(element):
+ raise TypeError('expected an Element, not %s' %
+ type(element).__name__)
self._root = element # first node
if file:
self.parse(file)
@@ -543,7 +545,9 @@ def _setroot(self, element):
with the given element. Use with care!
"""
- # assert iselement(element)
+ if not iselement(element):
+ raise TypeError('expected an Element, not %s'
+ % type(element).__name__)
self._root = element
def parse(self, source, parser=None):
@@ -709,6 +713,8 @@ def write(self, file_or_filename,
of start/end tags
"""
+ if self._root is None:
+ raise TypeError('ElementTree not initialized')
if not method:
method = "xml"
elif method not in _serialize:
diff --git
a/Misc/NEWS.d/next/Library/2025-06-22-02-16-17.gh-issue-135640.FXyFL6.rst
b/Misc/NEWS.d/next/Library/2025-06-22-02-16-17.gh-issue-135640.FXyFL6.rst
new file mode 100644
index 00000000000000..ad217b57b4b510
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-22-02-16-17.gh-issue-135640.FXyFL6.rst
@@ -0,0 +1,4 @@
+Address bug where it was possible to call
+:func:`xml.etree.ElementTree.ElementTree.write` on an ElementTree object with
+an invalid root element. This behavior blanked the file passed to ``write``
+if it already existed.
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