Using villares PVector (python implementation) in py5

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Turns out nditer actually can do what I wanted in a more elegant way (which also avoids crazy indexing):-

    nvalues = -np.arange(-50, 50, 10)
    pvalues = np.arange(-50, 50, 10)
    for x in np.nditer(pvalues): # top
        square.append(PVector(x, -50))
    for y in np.nditer(pvalues): # right side
        square.append(PVector(50, y))
    for x in np.nditer(nvalues): # bottom
        square.append(PVector(x, 50))
    for y in np.nditer(nvalues): # left side
        square.append(PVector(-50, y))

But unfortunately I cannot use py5.vertices as suggested, however that might be a consideration when creating a vector class (for my ruby processing Vec2D and Vec3D classes I have created to vertex methods for PShape and and custom renderer).