def tostring(self, root=None, doctype=None, pretty_print=True):
        """return the content of the XML document as a unicode string"""
        if root is None:
            root = self.root
        return etree.tounicode(
            root, doctype=doctype or self.info.doctype, pretty_print=pretty_print
        )
def tostring ( self , root = None , doctype = None , pretty_print = True ) : if root is None : root = self . root return etree . tounicode ( root , doctype = doctype or self . info . doctype , pretty_print = pretty_print )
return the content of the XML document as a unicode string