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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 point_displ(pt1, pt2):
 """ Calculate the displacement vector between two n-D points. pt1 - pt2 .. todo:: Complete point_disp docstring """


    #Imports
    import numpy as np

    # Make iterable
    if not np.iterable(pt1):
        pt1 = np.float64(np.array([pt1]))
    else:
        pt1 = np.float64(np.array(pt1).squeeze())
    ## end if
    if not np.iterable(pt2):
        pt2 = np.float64(np.array([pt2]))
    else:
        pt2 = np.float64(np.array(pt2).squeeze())
    ## end if

    # Calculate the displacement vector and return
    displ = np.matrix(np.subtract(pt2, pt1)).reshape(3,1)
    return displ