cpython

532b9dbd - gh-89499: Support the standalone document declaration in ElementTree (GH-156730)

gh-89499: Support the standalone document declaration in ElementTree (GH-156730) ElementTree.write(), tostring() and tostringlist() get the standalone parameter: True for standalone="yes", False for standalone="no", and None (the default) to omit it. An XML declaration is written if it is not None, and combining it with a false xml_declaration is an error.