how can i change the angle between two points of tangent of point spline (for example screen in 3ds max)?
If it is possible, how do it in python c4d
you have to use the function SetTangent
This thread ans this example will help you to understand how to do it.
You will also find a way to check if the spline you want to modify is a Bezier curve or not. By checking if the property of the spline c4d.SPLINEOBJECT_TYPE] is equal to c4d.SPLINETYPE_BEZIER:
Your question is about the angle of the tangent, but you cannot define that angle, you must define the position of the two handles.