question about how does python work in grasshopper

I have some curvesinto the grasshopper ,in contours array,and I feed the python component with them.Why don't I get the "x" variable as a list into the component although I feed the x variable with a list of curves???

Replies to This Discussion

Permalink Reply by Marios Tsiliakos on September 20, 2014 at 10:49am

There are no arrays in GH, there are data trees. Try to change the input hint of your python component to either list or datatree.

Hope that this helps.

Best,

Permalink Reply by Vasilis on September 20, 2014 at 11:19am

Wrong wording.Literally the output of contours component becomes the input of python component.So,my question,it's not a list into the python component?what is this?

thank you for your response

Permalink Reply by djordje on September 20, 2014 at 11:38am

I would listen to Marios advice and change the "x" input's "Type hint".
It would be better if you would attach the .gh file too.

Permalink Reply by Vasilis on September 20, 2014 at 2:14pm

As you can see , I tried to offset a list o f contours.The obvious thing is that python component doesn't work like python editor.

thanks for your response

Attachments:

python_problem.gh, 9 KB

Permalink Reply by djordje on September 20, 2014 at 2:33pm

Hi Vasilis.
Your "x" input type was set to "float" instead of "ghdoc object".
To access a certain item from python sequence (list in this case) use the square brackets.
The rs.OffsetCurve works the same as in Rhino Python editor. The problem is that it returns a list. Then you append its result to "a" list - which makes it a list of a list. Grasshopper does not support that. So you need to either make a branch and add the list which rs.OffsetCurve returns to that branch, or just append all elements returned from the rs.OffsetCurve function to "a" list, on at a time.

Please attach your .3dm file too, next time. Thanks.

Attachments: