langchain/document_loaders/pdf.py/PyMuPDFLoader/__init__
class PyMuPDFLoader:    def __init__(self, file_path: str) -> None:
        """Initialize with file path."""
        try:
            import fitz  # noqa:F401
        except ImportError:
            raise ImportError(
                "`PyMuPDF` package not found, please install it with "
                "`pip install pymupdf`"
            )

        super().__init__(file_path)