Clean up merge issue in whatsnew, remove escape in io.rst, adjust exc…

…eptions with added tests

doc/source/user_guide/io.rst

@@ -3012,7 +3012,7 @@ But assiging *any* temporary name to correct URI allows parsing by nodes.
                     namespaces={"pandas": "https://example.com"})
    df
 
-However, if XPath does not reference node names such as default, ``/\*``, then
+However, if XPath does not reference node names such as default, ``/*``, then
 ``namespaces`` is not required.
 
 With `lxml`_ as parser, you can flatten nested XML documents with an XSLT

doc/source/whatsnew/v1.3.0.rst

@@ -33,12 +33,6 @@ For example:
         storage_options=headers
     )
 
-.. _whatsnew_130.window_method_table:
-
-:class:`Rolling` and :class:`Expanding` now support a ``method`` argument with a
-``'table'`` option that performs the windowing operation over an entire :class:`DataFrame`.
-See ref:`window.overview` for performance and functional benefits. (:issue:`15095`)
-
 .. _whatsnew_130.read_to_xml:
 
 Read and write XML documents

pandas/io/formats/xml.py

@@ -6,7 +6,6 @@
 import io
 from typing import Any, Dict, List, Optional, Union
 from urllib.error import HTTPError, URLError
-from warnings import warn
 
 from pandas._typing import FilePathOrBuffer
 from pandas.errors import AbstractMethodError
@@ -252,7 +251,7 @@ def write_output(self) -> Optional[str]:
 
                 out_str = None
 
-        except (UnicodeDecodeError, OSError, FileNotFoundError) as e:
+        except (OSError, FileNotFoundError) as e:
             raise e
 
         return out_str
@@ -299,10 +298,8 @@ def build_tree(self) -> bytes:
             self.out_xml = self.remove_declaration()
 
         if self.stylesheet:
-            warn(
-                "To use stylesheet, you need lxml installed. "
-                "Instead, the non-transformed, original XML is returned.",
-                UserWarning,
+            raise ValueError(
+                "To use stylesheet, you need lxml installed and selected as parser."
             )
 
         return self.out_xml

pandas/io/xml.py

@@ -6,7 +6,6 @@
 import io
 from typing import Dict, List, Optional, Union
 from urllib.error import HTTPError, URLError
-from warnings import warn
 
 from pandas._typing import FilePathOrBuffer
 from pandas.compat._optional import import_optional_dependency
@@ -231,10 +230,8 @@ def __init__(self, *args, **kwargs):
     def parse_data(self) -> List[Dict[str, Optional[str]]]:
 
         if self.stylesheet:
-            warn(
-                "To use stylesheet, you need lxml installed. "
-                "Nodes will be parsed on original XML at the xpath.",
-                UserWarning,
+            raise ValueError(
+                "To use stylesheet, you need lxml installed and selected as parser."
             )
 
         self.xml_doc = self._parse_doc()

pandas/tests/io/formats/test_to_xml.py

@@ -24,15 +24,15 @@
 [X] - LookupError("unknown encoding")
 [X] - KeyError("...is not included in namespaces")
 [X] - KeyError("no valid column")
-[]  - OSError        (GENERAL ERROR WITH FileNotFoundError AS SUBCLASS)
+[X] - ValueError("To use stylesheet, you need lxml installed...")
+[]  - OSError        (NEED PERMISSOIN ISSUE, DISK FULL, ETC.)
 [X] - FileNotFoundError("No such file or directory")
 
 lxml
 [X] - TypeError("...is not a valid type for attr_cols")
 [X] - TypeError("...is not a valid type for elem_cols")
 [X] - LookupError("unknown encoding")
-[]  - UnicodeDecodeError  (NEED NON-UTF-8 STYLESHEET)
-[]  - OSError        (GENERAL ERROR WITH FileNotFoundError AS SUBCLASS)
+[]  - OSError        (NEED PERMISSOIN ISSUE, DISK FULL, ETC.)
 [X] - FileNotFoundError("No such file or directory")
 [X] - KeyError("...is not included in namespaces")
 [X] - KeyError("no valid column")
@@ -1153,6 +1153,24 @@ def test_incorrect_xsl_apply(parser):
             geom_df.to_xml(path, stylesheet=xsl)
 
 
+def test_stylesheet_with_etree(datapath):
+    xsl = """\
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+    <xsl:output method="xml" encoding="utf-8" indent="yes" />
+    <xsl:strip-space elements="*"/>
+
+    <xsl:template match="@*|node(*)">
+        <xsl:copy>
+            <xsl:apply-templates select="@*|node()"/>
+        </xsl:copy>
+    </xsl:template>"""
+
+    with pytest.raises(
+        ValueError, match=("To use stylesheet, you need lxml installed")
+    ):
+        geom_df.to_xml(parser="etree", stylesheet=xsl)
+
+
 @td.skip_if_no("lxml")
 def test_style_to_csv():
     xsl = """\

pandas/tests/io/test_xml.py

@@ -24,6 +24,7 @@
 [X] - ValueError("names does not match length of child elements in xpath.")
 [X] - TypeError("...is not a valid type for names")
 [X] - ValueError("io is not a url, file, or xml string")
+[X] - ValueError("To use stylesheet, you need lxml installed...")
 []  - URLError      (GENERAL ERROR WITH HTTPError AS SUBCLASS)
 [X] - HTTPError("HTTP Error 404: Not Found")
 []  - OSError        (GENERAL ERROR WITH FileNotFoundError AS SUBCLASS)
@@ -844,6 +845,16 @@ def test_wrong_stylesheet():
         read_xml(kml, stylesheet=xsl)
 
 
+def test_stylesheet_with_etree(datapath):
+    kml = os.path.join("data", "xml", "cta_rail_lines.kml")
+    xsl = os.path.join("data", "xml", "flatten_doc.xsl")
+
+    with pytest.raises(
+        ValueError, match=("To use stylesheet, you need lxml installed")
+    ):
+        read_xml(kml, parser="etree", stylesheet=xsl)
+
+
 @tm.network
 @td.skip_if_no("lxml")
 def test_online_stylesheet():