doccano/backend/data_import/pipeline/exceptions.py

class FileParseException(Exception):
    def __init__(self, filename: str, line_num: int, message: str):
        self.filename = filename
        self.line_num = line_num
        self.message = message

    def __str__(self):
        return f"ParseError: You cannot parse line {self.line_num} in {self.filename}: {self.message}"

    def dict(self):
        return {"filename": self.filename, "line": self.line_num, "message": self.message}