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So Autodesk documentation on this is sparse and a bit inaccurate.

In order to get this function to work you need to separate out the parameters at the ‘.’ (something I am finding is a common thread among many of maya’s library functions)

This is the way to do it:

Source code

selectedObject = cmds.ls(selection = True)
#Note that the .cv[0] is separated out from the variable, also note that the .cv index starts at 0, not at 1 as the maya documentation would lead you to believe
pointA = cmds.pointPosition('%s.cv[0]' % selectedObject[0])
pointB = cmds.pointPosition('%s.cv[1]' % selectedObject[0])
print('pointA is: ' + str(pointA))
print('pointB is: ' + str(pointB))

Note that this won’t work:

pointA = cmds.pointPosition(str(selectedCurve.cv[1]), world = True)

Because the .cv[1] is not separated out.

This however will work:

pointA = cmds.pointPosition(str(selectedCurve) + ‘.cv[0]’, world = True)#this is just another way of converting a variable to a string.

Because the .cv[1] is separated out.

Also as mentioned in the code, the index for the cv points starts as [0].  Autodesk documentation indicates that it starts a [1].