init() — langchain Function Reference

Architecture documentation for the __init__() function in xml.py from the langchain codebase.

Function python OutputParsing StreamingParsers

Entity Profile

OutputParsing→ StreamingParsers→ __init__() — langchain Function Reference

Dependency Diagram

graph TD
  50deded1_918c_1dd3_112f_623225519701["__init__()"]
  7c8ef0f6_8408_1c9b_5ed7_f17f7f527cbc["_StreamingParser"]
  50deded1_918c_1dd3_112f_623225519701 -->|defined in| 7c8ef0f6_8408_1c9b_5ed7_f17f7f527cbc
  style 50deded1_918c_1dd3_112f_623225519701 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/output_parsers/xml.py lines 49–78

    def __init__(self, parser: Literal["defusedxml", "xml"]) -> None:
        """Initialize the streaming parser.

        Args:
            parser: Parser to use for XML parsing.

                Can be either `'defusedxml'` or `'xml'`. See documentation in
                `XMLOutputParser` for more information.

        Raises:
            ImportError: If `defusedxml` is not installed and the `defusedxml` parser is
                requested.
        """
        if parser == "defusedxml":
            if not _HAS_DEFUSEDXML:
                msg = (
                    "defusedxml is not installed. "
                    "Please install it to use the defusedxml parser."
                    "You can install it with `pip install defusedxml` "
                )
                raise ImportError(msg)
            parser_ = XMLParser(target=TreeBuilder())
        else:
            parser_ = None
        self.pull_parser = ET.XMLPullParser(["start", "end"], _parser=parser_)
        self.xml_start_re = re.compile(r"<[a-zA-Z:_]")
        self.current_path: list[str] = []
        self.current_path_has_children = False
        self.buffer = ""
        self.xml_started = False