(prefix, uri)
Register a namespace prefix.

    The registry is global, and any existing mapping for either the
    given prefix or the namespace URI will be removed.

    *prefix* is the namespace prefix, *uri* is a namespace uri. Tags and
    attributes in this namespace will be serialized with prefix if possible.

    ValueError is raised if prefix is reserved or is invalid.
Register a namespace prefix.
Register a namespace prefix .
def register_namespace(prefix, uri):
    """Register a namespace prefix.

    The registry is global, and any existing mapping for either the
    given prefix or the namespace URI will be removed.

    *prefix* is the namespace prefix, *uri* is a namespace uri. Tags and
    attributes in this namespace will be serialized with prefix if possible.

    ValueError is raised if prefix is reserved or is invalid.

    """
    if re.match(r"ns\d+$", prefix):
        raise ValueError("Prefix format reserved for internal use")
    for k, v in list(_namespace_map.items()):
        if k == uri or v == prefix:
            del _namespace_map[k]
    _namespace_map[uri] = prefix
def register_namespace ( prefix , uri ) : if re . match ( r"ns\d+$" , prefix ) : raise ValueError ( "Prefix format reserved for internal use" ) for k , v in list ( _namespace_map . items ( ) ) : if k == uri or v == prefix : del _namespace_map [ k ] _namespace_map [ uri ] = prefix