code: def set_bytes_at_offset(self, offset, data):
          
  
          if not isinstance(data, bytes):
              raise TypeError('data should be of type: bytes')
  
          if 0 <= offset < len(self.__data__):
              self.__data__ = ( self.__data__[:offset] + data + self.__data__[offset+len(data):] )
          else:
              return False
  
          return True
docs: Overwrite the bytes at the given file offset with the given string.
  
          Return True if successful, False otherwise. It can fail if the
          offset is outside the file's boundaries.