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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read_array(self, dtype, count=-1, out=None):
 """Return numpy array from file in native byte order."""

        fh = self._fh
        dtype = numpy.dtype(dtype)

        if count < 0:
            size = self._size if out is None else out.nbytes
            count = size // dtype.itemsize
        else:
            size = count * dtype.itemsize

        result = numpy.empty(count, dtype) if out is None else out

        if result.nbytes != size:
            raise ValueError('size mismatch')

        n = fh.readinto(result)
        if n != size:
            raise ValueError('failed to read %i bytes' % size)

        if not result.dtype.isnative:
            if not dtype.isnative:
                result.byteswap(True)
            result = result.newbyteorder()
        elif result.dtype.isnative != dtype.isnative:
            result.byteswap(True)

        if out is not None:
            if hasattr(out, 'flush'):
                out.flush()

        return result