need help with this code. (python)

For this lab you will create a custom class that implements a point in 3-D space. Name your class 'pt3d. The class will have three attributes, x,y,z. These x,y,z values should default to zero. Given two instances of the pt3d class a and b. implement methods such that a+b returns a new pt3d object whose X, y and z values are the sum of the a and b x, y and z values a-b returns the Euclidean distance between points a and b a==b returns true if the x, y and z values of a and b are equal, false otherwise When you call print(a) the printout should be of the format '' You can test and develop your class either from the main block in your program, from another module, or using the python interpreter directly >>> from pt 3d import pt 3d >>> pl-pt3d (1,1,1) >>> p2=pt3d (2,2,2) >>> print (pl+p2) >>> print (pl-p2) 1.7320508075688772 >>> pl==p2 False >>> pl+pl==p2 True