Como comprimir whitespace en XML usando Python

<root><parent><child><subchild>   This is some text with    irregular   spacing.   </subchild><subchild>Another piece of text with\n                newlines and     tabs.</subchild></child><child><subchild>Text with\n                multiple\n                lines.</subchild><subchild>   Leading and trailing spaces   </subchild></child></parent><parent><child><subchild>Mixed    whitespace    types.</subchild><subchild>   </subchild></child></parent></root>

import io
from lxml import etree

def compress_xml_whitespace(input_bytes: io.BytesIO) -> io.BytesIO:
    """
    Comprime el whitespace en un archivo XML.
    Args:
        input_bytes (io.BytesIO): El objeto BytesIO de entrada que contiene el contenido XML.
    Returns:
        io.BytesIO: El objeto BytesIO de salida que contiene el contenido XML comprimido.
    """
    input_bytes.seek(0)  # Resetear la posicion al inicio del objeto BytesIO

    parser = etree.XMLParser(remove_blank_text=True)
    tree = etree.parse(input_bytes, parser)

    # Convertir el arbol XML a un string sin pretty printing (sin newlines o indentacion)
    compressed_xml = etree.tostring(tree, pretty_print=False, encoding='utf-8')

    # Escribir el XML comprimido al output BytesIO
    output_bytesio = io.BytesIO(compressed_xml)
    # Resetear el puntero del output BytesIO al inicio
    output_bytesio.seek(0)
    return output_bytesio

test_xml = """<root>
    <parent>
        <child>
            <subchild>   This is some text with    irregular   spacing.   </subchild>
            <subchild>Another piece of text with
                newlines and     tabs.</subchild>
        </child>
        <child>
            <subchild>Text with
                multiple
                lines.</subchild>
            <subchild>   Leading and trailing spaces   </subchild>
        </child>
    </parent>
    <parent>
        <child>
            <subchild>Mixed    whitespace    types.</subchild>
            <subchild>   </subchild>
        </child>
    </parent>
</root>"""

test_xml_bytesio = io.BytesIO(test_xml.encode('utf-8'))

compress_xml_whitespace(test_xml_bytesio).read().decode('utf-8')

<root><parent><child><subchild>   This is some text with    irregular   spacing.   </subchild><subchild>Another piece of text with\n                newlines and     tabs.</subchild></child><child><subchild>Text with\n                multiple\n                lines.</subchild><subchild>   Leading and trailing spaces   </subchild></child></parent><parent><child><subchild>Mixed    whitespace    types.</subchild><subchild>   </subchild></child></parent></root>