<pre> ptMtx = {(0,0):['firstX', 'firstY'],(1,1):['secondX', 'secondY']} </pre> What value does ptMtx[1,1] return?

ptMtx[1,1] will accesses the value corresponding to the (1,1) key in the ptMtx dictionary.

<pre> ptMtx = {} for i in range(15): for j in range(15): x = i * 10 y = j * 10 z = 0 ptMtx[i,j] = (x,y,z) for id in ptMtx: rs.AddPoint(ptMtx[id]) </pre> What does each of the key and value pairs in the above dictionary ptMtx represent?

The structure of each dictionary key-value pair would be as follows: {(i, j): (x, y, z)} , representing a 2 numbered index and 3 numbered coordinate.

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