@staticmethod
    def _unhandledErrback(error, unhandled):
        unhandled.append(error)
        return None
Takes a file_like object (e.g. anything conforming to python's file interface
dataset/ETHPy150Open facebook/sparts/sparts/vtask.py/ExecuteContext._unhandledErrback--crossover with--dataset/ETHPy150Open scalyr/scalyr-agent-2/scalyr_agent/line_matcher.py/LineMatcher._readline