PYTHON - Check existance of point in a list of points

Hi everyone!

I'm haveing some trouble with the test of the existance of some points in a list of other points.

The comparison in python works, but it checks the existance of a value in a list, and does not work for points.

ListA = [0,1,2,3,4,5,6]

ListB = [1,2]
Res = []

for i in range(len(ListA)):

    if (ListA[i] in ListB) is True:

          Res.append(None)

   else:

          Res.append(ListA[i])

The result is 

Res = [0,None,None,3,4,5,6]

This is ok. But when i apply the same method to list with points, it doesn't work.
Do you know another way for this?

Thanks,
Edo