<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def read_bytes(self, start_position: int, size: int) -> bytes: """ Read a value from memory and return a fresh bytes instance """

        return bytes(self._bytes[start_position:start_position + size])