gh-49099: Add new optional arguments to minidom.Element constructor.

Lib/test/test_minidom.py

@@ -1741,5 +1741,38 @@ def test_cdata_parsing(self):
         dom2 = parseString(dom1.toprettyxml())
         self.checkWholeText(dom2.getElementsByTagName('node')[0].firstChild, '</data>')
 
+    def testElementConstructor(self):
+        dom = parse(tstfile)
+        child1 = dom.createComment("Hello 1")
+        child2 = dom.createComment("Hello 2")
+
+        attributes = {
+            "first": "1",
+            "second": "2",
+            }
+
+        attributesNS = {
+            ("http://www.w3.org", "xmlns:python"): "http://www.python.org",
+            }
+
+        element = xml.dom.minidom.Element(
+            "some_tag",
+            childNodes=[child1, child2],
+            attributes=attributes,
+            attributesNS=attributesNS
+            )
+
+        self.assertEqual(child1.data, element.childNodes[0].data)
+        self.assertEqual(child2.data, element.childNodes[1].data)
+
+        for name, value in attributes.items():
+            self.assertEqual(value, element.getAttribute(name))
+
+        self.assertEqual(
+            element.getAttributeNS(
+                "http://www.w3.org", "python"),
+                "http://www.python.org"
+                )
+
 if __name__ == "__main__":
     unittest.main()

Lib/xml/dom/minidom.py

@@ -695,12 +695,16 @@ class Element(Node):
                          Node.ENTITY_REFERENCE_NODE)
 
     def __init__(self, tagName, namespaceURI=EMPTY_NAMESPACE, prefix=None,
-                 localName=None):
+                 localName=None, childNodes=None, attributes=None, attributesNS=None):
         self.parentNode = None
+        self.ownerDocument = None
         self.tagName = self.nodeName = tagName
         self.prefix = prefix
         self.namespaceURI = namespaceURI
         self.childNodes = NodeList()
+        if childNodes:
+            for child in childNodes:
+                self.appendChild(child)
         self.nextSibling = self.previousSibling = None
 
         # Attribute dictionaries are lazily created
@@ -713,6 +717,13 @@ def __init__(self, tagName, namespaceURI=EMPTY_NAMESPACE, prefix=None,
         # namespaces.
         self._attrs = None
         self._attrsNS = None
+        if attributes:
+            for name, value in attributes.items():
+                self.setAttribute(name, value)
+
+        if attributesNS:
+            for (namespace, name), value in attributesNS.items():
+                self.setAttributeNS(namespace, name, value)
 
     def _ensure_attributes(self):
         if self._attrs is None: