Merge two lists which representing points with python/ programming merge element with python

I´m working with python in Rhino 3D and have following problem. I have two Lists representing points. List one for example:

StartPoints = [[x1,y1,z1],[x2,y2,z2],[x3,y3,z3]]

and the second list is:

EndPoints = [[x4,y4,z4],[x5,y5,z5],[x6,y6,z6]]

My goal is to join them in following form:

MergedPoints = [[x1,y1,z1],[x2,y2,z2],[x3,y3,z3],[x4,y4,z4],[x5,y5,z5]]

Everything I tried didn´t worked. When I use zip it gives me 3 branches with 3 elements. When I try to use map it says "Point3d is not callabe". My Goal is one List with 6 points just like the merge element in grasshopper would give. Thanks for your help!

Replies to This Discussion

Permalink Reply by Joseph Oster on March 8, 2017 at 6:42am

Try the coding forum: http://www.grasshopper3d.com/forum/categories/vb-c-and-python-codin...

Or look it up: http://stackoverflow.com/questions/1720421/how-to-append-list-to-se...

Python makes this ridiculously easy.

mergedlist = listone + listtwo

Or in your case: MergedPoints = S + E

Permalink Reply by Apfelbaum on March 8, 2017 at 7:10am

Thats what I tried but didn´t worked for me ;)

Permalink Reply by Joseph Oster on March 8, 2017 at 7:27am

OK, I see now why you have to get the two lists of end points before "P = S + E" will work. It appears to me that the code you posted will jumble the sequence, though, instead of adding a list of end points to a list of start points.

Why use Python for this at all?

Permalink Reply by Apfelbaum on March 8, 2017 at 7:28am

Because it will be a part of a bigger script which I only can build up with python.

Permalink Reply by Apfelbaum on March 8, 2017 at 6:51am

I got it by my own.

import rhinoscriptsyntax as rs

merged = []

for i in range(0,len(C)):
    S = rs.CurveStartPoint(C[i])
    merged.append(S)
    E = rs.CurveStartPoint(C[i])
    merged.append(E)
P = merged

Permalink Reply by Joseph Oster on March 8, 2017 at 6:56am

Absurdly complex compared to "P = S + E".

Permalink Reply by Joseph Oster on March 8, 2017 at 7:35am

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