Python, Not Returning Result Outside Function

Rhino Developer
1 
#SelectSurfaceCornerGrips

import rhinoscriptsyntax as rs

srf = rs.GetSurfaceObject('Select a surface for corner point display', preselect=True)
if srf:
    srf = srf [0]

srfPtCount = rs.SurfacePointCount(srf)
uCount = srfPtCount [0]
vCount = srfPtCount [1]
srfPtCount = uCount*vCount

#Report the total number of points, Yes/No option?
def PrintSurfacePointCount():
    
    print "Point Count: " + (str(srfPtCount))
    print "U Count: " + str(uCount) 
    print "V Count: " + str(vCount)


def SelectSurfaceCornerGrips(srf):
    
    #u is a row index, with a total of 'v' points, Corners at (u0, u1, u2, u3)
    u1index = uCount-1 # Zero based, final point of first row
    u3index = srfPtCount-1 #Zero based, final point of the surface
    
    rs.EnableObjectGrips(srf)
    u0 = rs.SelectObjectGrip(srf, 0)
    u3 = rs.SelectObjectGrip(srf, u3index)
    u1 = rs.SelectObjectGrip(srf, vCount-1)
    u2 = rs.SelectObjectGrip(srf, srfPtCount-vCount)
    
    p0 = rs.ObjectGripLocation(srf, 0)
    p1 = rs.ObjectGripLocation(srf, u3index)
    p2 = rs.ObjectGripLocation(srf, vCount-1)
    p3 = rs.ObjectGripLocation(srf, srfPtCount-vCount)

    points = (p0, p1, p2, p3)
    return points

SelectSurfaceCornerGrips(srf)

print points

if points:
    rs.AddPoints(points)

PrintSurfacePointCount()

#Option for Creating Points VS Selecting the Points
#Will it work for 3 sided surfaces?

I’m trying to clean up some of my early code trials and learning by trying functions. I thought I was using return properly, to return the result of some arguments in my function SelectSurfaceCornerGrips function to use later on. In return points and then print points, it becomes clear I haven’t used it correctly. It worked before anyway as a line by line piece of code, so I’ve kind of taken a step backwards by adding the functions, for now.

Any help appreciated!

2

should read:

points = SelectSurfaceCornerGrips(srf)

You do return points, but you weren’t assigning the result to any variable, so they went straight to bit heaven.

3

Thank you Nathan!

Makes sense, merely invoking the function wasn’t actually returning the data anywhere.

Baby steps continue…