Trying to exchange a defaultdict (python)

I understand from this post that it is possible transfer a python dictionary from one component to another if the dictionary is wrapped in a custom class.

Following Benjamin Golder's example, I've written a class, ghDefaultDict, in order to use the defaultdict. Similarly, the dictionary itself is at variablename.d

It seems to work, however, about 50% of the time (this happens more often in a complex definition, and especially after unlocking the canvas) the component to which the data is passed returns a completely empty dictionary. For example, these two python components should print the same thing, and they do here, but fairly often, the second will print "KEYS: []" instead.

Any thoughts on why this is or how to fix it?

This file is attached below. The Python_2 component contains only the code:

print("KEYS:")
print(x.d.keys())

Attachments:

ghPy-DefaultDict.gh, 42 KB

Replies to This Discussion

Permalink Reply by Jason Lim on March 2, 2014 at 8:02pm

Hi Trevor,

I took a quick look at your definition since I had the same question (passing dictionaries around) a while ago.

I don't get the error you described, but edited the code in your components (mainly your class constructor the sticky component and then few lines of code in 'Python_1'). Hopefully it helps.

Attachments:

ghPyDefaultDict_JL.gh, 46 KB

Permalink Reply by trevor.patt on March 4, 2014 at 6:18am

Thanks for looking. In this case, I can have more than one curve at a given height and want to be able to assign all of those at the same level to the same key: thus defaultdict instead of just dict.

Your version only allows one element per key so the dictionary only contains the pink curves.:

But if I change the class constructor to: