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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 RadiusGrid(gridSize):
 """ Return a square grid with values of the distance from the centre of the grid to each gridpoint """

    x,y=np.mgrid[0:gridSize,0:gridSize]
    x = x-(gridSize-1.0)/2.0
    y = y-(gridSize-1.0)/2.0
    return np.abs(x+1j*y)