holes in drawing

[Timerlen]

I was wondering, I don't know if it is right or it is possible to count the number of holes in this drawing

can I do everything on SPLINE and check if SPLINE is closed and count? Maybe there is another method to solve my problem?

[mozman]

The SPLINE entity has a CLOSED flag (Spline.closed property), which could be checked, but as often this data is not reliable, the better way is to calculate the start- and end point and check if they are close.

for entity in msp.query("SPLINE"):
    bspline = entity.construction_tool()
    start, end = bspline.points([0, bspline.max_t])
    if start.isclose(end):
        # SPLINE is closed
        ...