Python Component - Adding References

Replies to This Discussion

Permalink Reply by Benjamin Golder on March 7, 2012 at 12:02am

Let's assume you have a module called 'pyscripts.py'

if you look at the output of this code:

import sys
for p in sys.path:
    print p

It will show you a list of folders that you can import modules from. You can put pyscripts.py in one of those folders and then import as usual:

import pyscripts

 

Or, you can add new folders to the list like this:

import sys
my_path = '/path/to/my/folder/of/code'
sys.path.append(my_path)
import myscripts 

Permalink Reply by Benjamin Golder on March 7, 2012 at 12:05am

related:

https://github.com/mcneel/ghpython/issues/16

and:

https://github.com/mcneel/ghpython/issues/12

Permalink Reply by Jason Lim on March 7, 2012 at 2:00am

Hi Benjamin, great this works perfectly. a big thank you!

Permalink Reply by Giulio Piacentino on March 7, 2012 at 4:20am

Please use the sample from https://github.com/mcneel/ghpython/issues/16 and not the one here above. There needs to be an if, or the code will add more and more items to the list, making it slower at each iteration.

Thanks,

- Giulio
_______________
giulio@mcneel.com

Permalink Reply by Benjamin Golder on March 8, 2012 at 6:42pm

forgot about that, thanks.

Permalink Reply by Giulio Piacentino on March 7, 2012 at 2:18am

You can also pass functions (or callable objects) in GhPython.

- Giulio
________________
giulio@mcneel.com

Permalink Reply by Jason Lim on March 7, 2012 at 3:10am

Hi Giulio, I took a look at that definition but how do you pass multiple functions? Am I restricted to only 1 function per component?

Permalink Reply by Giulio Piacentino on March 7, 2012 at 4:15am

You could also pass a list or tuple of functions.
This is just a possibility, though: you can choose the method that works best for you

• loading a .py file (module) from a folder. Possibly, you can add the path to sys.path so you can add any specific folder you would like
• passing functions/callable objects/objects between components
• assigning data/functions to the scriptcontext.sticky dictionary, that is accessible from every component and is shared

I'd say all these methods are valid and you can choose the one you like better.

- Giulio
______________
giulio@mcneel.com

Permalink Reply by Jason Lim on March 8, 2012 at 6:27pm

Hi Giulio,

Thanks for listing out the various options. Out of curiousity is it possible to pass a dictionary of functions between components? In the attached defintion, instead of an output that is a dictionary, i get a list of strings (of the keys).

Attachments:

• 120309_132_CodeExperimentation.gh, 2 KB

Permalink Reply by Benjamin Golder on March 8, 2012 at 6:40pm

If you wrap it in a custom class you can:

 

class FuncDict():
    def __init__(self, d):
        self.d = d

f = FuncDict(my_dict)
my_new_dict = f.d


The problem you're encountering is that dictionaries have an __iter__() method that returns their keys, and Grasshopper automatically looks for an Iterable interface to convert objects that exit components. So dictionaries get turned into a list of keys.

 

It would be nice if instead they could be recognized as KeyValuePairs, or as Python objects.

Permalink Reply by Jason Lim on March 8, 2012 at 7:11pm

Hi Benjamin, thanks for the quick response and clearing up the confusion about dictionaries. It works now but I think using either your method or Giulio's suggestions for passing functions /add references would be a more elegant way to go about it. Yes it would be very useful if we could pass dictionaries around, it seems like there is no way to do this in either C# or python?