ElementTree.write

Write element tree to a file as XML.

Arguments:
  *file_or_filename* -- file name or a file object opened for
                        writing

  *encoding* -- the output encoding (default: US-ASCII)

  *xml_declaration* -- bool indicating if an XML declaration should
                       be added to the output. If None, an XML
                       declaration is added if encoding IS NOT
                       either of: US-ASCII, UTF-8, or Unicode

  *default_namespace* -- sets the default XML namespace (for
                         "xmlns")

  *method* -- either "xml" (default), "html, "text", or "c14n"

  *short_empty_elements* -- controls the formatting of elements
                            that contain no content.  If True
                            (default) they are emitted as a single
                            self-closed tag, otherwise they are
                            emitted as a pair of start/end tags