init() — langchain Function Reference

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

Function python Observability TelemetryUtilities

Entity Profile

Observability→ TelemetryUtilities→ __init__() — langchain Function Reference

Dependency Diagram

graph TD
  2ea2042b_775c_4bd9_cf6b_c76b82d9b660["__init__()"]
  52737fd4_dd58_4289_8b70_0131f09b23a5["FileCallbackHandler"]
  2ea2042b_775c_4bd9_cf6b_c76b82d9b660 -->|defined in| 52737fd4_dd58_4289_8b70_0131f09b23a5
  style 2ea2042b_775c_4bd9_cf6b_c76b82d9b660 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/callbacks/file.py lines 60–79

    def __init__(
        self, filename: str, mode: str = "a", color: str | None = None
    ) -> None:
        """Initialize the file callback handler.

        Args:
            filename: Path to the output file.
            mode: File open mode (e.g., `'w'`, `'a'`, `'x'`). Defaults to `'a'`.
            color: Default text color for output.

        """
        self.filename = filename
        self.mode = mode
        self.color = color
        self._file_opened_in_context = False
        self.file: TextIO = cast(
            "TextIO",
            # Open the file in the specified mode with UTF-8 encoding.
            Path(self.filename).open(self.mode, encoding="utf-8"),  # noqa: SIM115
        )