In [1]: from numpy_buffer import RingBuffer

In [2]: N = 10

In [3]: ring = RingBuffer(size_max=10, default_value=0.0, dtype=float)

In [4]: ring
Out[4]:
<RingBuffer
    all:     array([ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.])
    partial: array([], dtype=float64)
    size/size_max: 0 / 10
>

In [5]: ring.append(1.2)

In [6]: ring
Out[6]:
<RingBuffer
    all:     array([ 1.2 ,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ,  0.])
    partial: array([ 1.2])
    size/size_max: 1 / 10
>

In [7]: ring.append(2.1)

In [8]: ring
Out[8]:
<RingBuffer
    all:     array([ 2.1 ,  1.2 ,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ,  0.,  0.])
    partial: array([ 2.1 ,  1.2])
    size/size_max: 2 / 10
>

In [9]: ring.all
Out[9]: array([ 2.1,  1.2,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ,  0. ])

In [10]: ring.partial
Out[10]: array([ 2.1,  1.2])

In [11]: ring.partial[::-1]
Out[11]: array([ 1.2,  2.1])