change format_as_xml defaults (pydantic#2228)

Author: samuelcolvin

pydantic_ai_slim/pydantic_ai/format_prompt.py

@@ -13,9 +13,8 @@
 
 def format_as_xml(
     obj: Any,
-    root_tag: str = 'examples',
-    item_tag: str = 'example',
-    include_root_tag: bool = True,
+    root_tag: str | None = None,
+    item_tag: str = 'item',
     none_str: str = 'null',
     indent: str | None = '  ',
 ) -> str:
@@ -32,8 +31,6 @@ def format_as_xml(
         root_tag: Outer tag to wrap the XML in, use `None` to omit the outer tag.
         item_tag: Tag to use for each item in an iterable (e.g. list), this is overridden by the class name
             for dataclasses and Pydantic models.
-        include_root_tag: Whether to include the root tag in the output
-            (The root tag is always included if it includes a body - e.g. when the input is a simple value).
         none_str: String to use for `None` values.
         indent: Indentation string to use for pretty printing.
 
@@ -55,7 +52,7 @@ def format_as_xml(
     ```
     """
     el = _ToXml(item_tag=item_tag, none_str=none_str).to_xml(obj, root_tag)
-    if not include_root_tag and el.text is None:
+    if root_tag is None and el.text is None:
         join = '' if indent is None else '\n'
         return join.join(_rootless_xml_elements(el, indent))
     else:

tests/test_examples.py

@@ -502,7 +502,7 @@ async def model_logic(  # noqa: C901
             )
         elif m.content.startswith('Write a list of 5 very rude things that I might say'):
             raise UnexpectedModelBehavior('Safety settings triggered', body='<safety settings details>')
-        elif m.content.startswith('<examples>\n  <user>'):
+        elif m.content.startswith('<user>\n  <name>John Doe</name>'):
             return ModelResponse(
                 parts=[ToolCallPart(tool_name='final_result_EmailOk', args={}, tool_call_id='pyd_ai_tool_call_id')]
             )

tests/test_format_as_xml.py

@@ -123,35 +123,35 @@ class ExamplePydanticModel(BaseModel):
         ),
     ],
 )
-def test(input_obj: Any, output: str):
-    assert format_as_xml(input_obj) == output
+def test_root_tag(input_obj: Any, output: str):
+    assert format_as_xml(input_obj, root_tag='examples', item_tag='example') == output
 
 
 @pytest.mark.parametrize(
     'input_obj,output',
     [
-        pytest.param('a string', snapshot('<examples>a string</examples>'), id='string'),
-        pytest.param('a <ex>foo</ex>', snapshot('<examples>a &lt;ex&gt;foo&lt;/ex&gt;</examples>'), id='string'),
-        pytest.param(42, snapshot('<examples>42</examples>'), id='int'),
+        pytest.param('a string', snapshot('<item>a string</item>'), id='string'),
+        pytest.param('a <ex>foo</ex>', snapshot('<item>a &lt;ex&gt;foo&lt;/ex&gt;</item>'), id='string'),
+        pytest.param(42, snapshot('<item>42</item>'), id='int'),
         pytest.param(
             [1, 2, 3],
             snapshot("""\
-<example>1</example>
-<example>2</example>
-<example>3</example>\
+<item>1</item>
+<item>2</item>
+<item>3</item>\
 """),
             id='list[int]',
         ),
         pytest.param(
             [[1, 2], [3]],
             snapshot("""\
-<example>
-  <example>1</example>
-  <example>2</example>
-</example>
-<example>
-  <example>3</example>
-</example>\
+<item>
+  <item>1</item>
+  <item>2</item>
+</item>
+<item>
+  <item>3</item>
+</item>\
 """),
             id='list[list[int]]',
         ),
@@ -166,24 +166,22 @@ def test(input_obj: Any, output: str):
         pytest.param(
             [datetime(2025, 1, 1, 12, 13), date(2025, 1, 2)],
             snapshot("""\
-<example>2025-01-01T12:13:00</example>
-<example>2025-01-02</example>\
+<item>2025-01-01T12:13:00</item>
+<item>2025-01-02</item>\
 """),
             id='list[date]',
         ),
     ],
 )
 def test_no_root(input_obj: Any, output: str):
-    assert format_as_xml(input_obj, include_root_tag=False) == output
+    assert format_as_xml(input_obj) == output
 
 
 def test_no_indent():
-    assert format_as_xml([1, 2, 3], indent=None) == snapshot(
-        '<examples><example>1</example><example>2</example><example>3</example></examples>'
-    )
-    assert format_as_xml([1, 2, 3], indent=None, include_root_tag=False) == snapshot(
-        '<example>1</example><example>2</example><example>3</example>'
+    assert format_as_xml([1, 2, 3], indent=None, root_tag='example') == snapshot(
+        '<example><item>1</item><item>2</item><item>3</item></example>'
     )
+    assert format_as_xml([1, 2, 3], indent=None) == snapshot('<item>1</item><item>2</item><item>3</item>')
 
 
 def test_invalid_value():
@@ -197,8 +195,8 @@ def test_invalid_key():
 
 
 def test_set():
-    assert '<example>1</example>' in format_as_xml({1, 2, 3})
+    assert '<example>1</example>' in format_as_xml({1, 2, 3}, item_tag='example')
 
 
 def test_custom_null():
-    assert format_as_xml(None, none_str='nil') == snapshot('<examples>nil</examples>')
+    assert format_as_xml(None, none_str='nil') == snapshot('<item>nil</item>')