def read_bytes(self, num_bytes, callback, streaming_callback=None):
        self._set_read_callback(callback)
        assert isinstance(num_bytes, numbers.Integral)
        self._read_bytes = num_bytes
        self._streaming_callback = stack_context.wrap(streaming_callback)
        self._try_inline_read()
Run callback when we read the given number of bytes.
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/iostream.py/BaseIOStream.read_bytes