Python in Dynamo: Basic Examples

[@isaiass.1951]

Hi, I'm from Brazil, and your video help me so much... Thanks

[@AussieBIMGuru]

You're welcome! Great to know I have viewers in Brazil :)

[@michaelwickerson4862]

Thank you for this series, I wish I started with revit, dynamo and python before grasshopper and rhino3D. Michael

[@AussieBIMGuru]

They're both highly valuable platforms - I use both! The only thing I wish was different in Grasshopper was a bit more list logic at the surface level, trees are powerful for geometry, but challenging in other scenarios.

[@damirces]

Really great series that you made Gavin. I am using Revit 2022 and for example Dynamo Node "if" works just fine. Also the first two basic codes for "if" node that you made doesn't work. Start working from the moment when you used if and else with the IN...

[@AussieBIMGuru]

Yes they fixed it eventually in later builds to behave properly. As far as I know the code I used should still work, make sure there are no typos or missing colons.

[@eng.tiago.b]

bro, epic intro hahha greetings from Brazil

[@AussieBIMGuru]

Haha thanks!

[@ATTechTutorials]

Great concepts for learning the basics of Python in Dynamo! Thanks Gavin!

[@AussieBIMGuru]

Cheers Alan! Next week we go deeper so wanted to start simple

[@youpeng7008]

Despite my english is bad, i can inderstang very well Thank you

[@AussieBIMGuru]

You are welcome! I am glad it is still understandable, and thank you for the kind feedback.

[@陳冠亦-j4s]

Thanks Gavin! I appreciate it, learned a lot.

[@AussieBIMGuru]

You're welcome!

[@rezwanulhoque117]

In the last part of this tutorial, you created a python script for random numbers, when you run the script numbers are automatically generated without code block.... how?

[@AussieBIMGuru]

At 22:40 I show that my node has some default inputs. These can be set inside the custom node input nodes using the syntax inputName: dataType = default value

[@mago_Maximo_do_Universo]

bro, epic intro

[@AussieBIMGuru]

Haha thanks! I shortened it eventually as it was a bit on the long side....

[@LinhKSD]

5:53 please explain, what is the "if_bool" in "if if_bool:" syntax in this case?

[@LinhKSD]

"if bool" is 1 condition?

[@AussieBIMGuru]

In this case I am storing the input as a variable. This can sometimes be more useful if you want to use the input more than once in your code.

[@LinhKSD]

@@AussieBIMGuru It will automatically interpret the condition as True, right? thanks

[@AussieBIMGuru]

@@LinhKSD no. It's just a variable name and will store the value provided to the input er assign to it (the boolean going into IN[0]).

[@engomardriouich9329]

i have tried the script but I have got a problem with the dwg file. when I opened the file it doesn't have the filters that it was in the Revit sheet. the colors look different than the Revit and also the filters that were applied in Revit it doesn't have them. what can I do to get the DWG files to look the same as the Revit sheet?

[@AussieBIMGuru]

I don't believe this is possible. You can choose layer/import settings in Revit under options, but filters etc. don't carry over when exported from Revit naturally, so Dynamo can't apply them either. In AutoCAD generally you would need to configure a .ctb file to control line weights and colours.

[@tumzarelaxing]

Question ? ? ? ? ? - Hi Guru, How can you setup a Loop that uses While (iteration of count at levels). How will you implement, Geometry.intersect and IndexOF and GetItematIndex. 2. how do you deal with levels list.map (iteration to collect information for each 3 levels deep at L2).

[@AussieBIMGuru]

I typically wouldn't to be honest, I recommend trying to get geometry into a consistent list structure and then you can iterate at a predictable depth. Usually in data science and also Dynamo it is best to clean data before working with it rather than receiving it in unpredictable shapes. If you want to exhaust levels anyway, you would need to run a for loop across all item at the top level of the data structure, then iterate within a try/except/break statement probably so that if it doesn't work, it can move on. For running some functions at levels from Dynamo I usually prefer to package my Python into a custom node and can then work with levels in the node itself.

[@tumzarelaxing]

Thanks for the reply

[@immi85]

again great video.

[@AussieBIMGuru]

Cheers Immi! Hope these help give some more context to your learning during the Python series. You'll see in the next video the usefulness of 'for' loops when dealing with Dynamo elements in lists.

[@immi85]

@@AussieBIMGuru sure 👍

[@adityakelkar7178]

Hi Gavin, thanks for another great video! Just a quick question about the random package. I am getting an IronPython error saying the random package is not defined. Do I need to install that somehow in Dynamo?

[@AussieBIMGuru]

I believe you may need a certain build of Dynamo to access it - in my case I'm using Revit 2020 and Dynamo 2.3. I believe they introduced it in 2.1 but not 100% certain.

[@vntk7686]

Great video! I want to use python libralies numpy and scipy, if you have any idea, could you tell me?

[@AussieBIMGuru]

It isn't present by default, but GHRemote might allow you to run external packages if you use Rhino Inside; www.food4rhino.com/app/gh-python-remote I don't believe Dynamo itself can access these packages directly as it uses IronPython, whilst these rely on CPython.

[@Faizan-k8t]

How much python should i know for dynamo...?

[@AussieBIMGuru]

It depends what you need to do with it. Most users get by with no understanding. Personally I learnt it because; - It provides more efficient list management (e.g. for loops, if statements) - It allows custom node development - It provided me with access to Revit API commands My specific 'bending point' was that I needed to set the time of day in multiple Revit views, and no custom package I could find was able to do this, so I learnt about Revit API and Python and eventually built a custom node to achieve this (most of which uses Python, and can be found in my custom package on my github). I would suggest you first learn the fundamentals - definitely watch my 10 part quick tip series which will give you the core skills in Python that you will need for Dynamo Python.

[@Faizan-k8t]

@@AussieBIMGuru Thank you 👌

[@aliarslan8313]

I couldn't find your python template on your github, can you share the path?

[@AussieBIMGuru]

github.com/aussieBIMguru/Misc/blob/master/PythonTemplate.py

[@aliarslan8313]

@@AussieBIMGuru Thank you so much

[@Gustavostarke]

Great lesson. I tried to replicate the last but it's not working.. here's my code (should be exaclty like yours) Am i missing something? Thanks in advance ------------ from random import seed from random import random rcount = IN[0] rseed = IN[1] rmin = IN[2] rmax = IN[3] seed(rseed) nums[] for r in range(rcount): val = rmin + (random() * (rmax-rmin)) nums.append(val) OUT = nums --------------

[@AussieBIMGuru]

The only error I can see is the line nums[] should be nums = []

[@Gustavostarke]

@@AussieBIMGuru Thats it! Thanks a lot for replying! Reallly appreciate it.

[@borun67]

Thanks.👃👃👃👃👃

[@AussieBIMGuru]

You're welcome!

[@plaiclaudiamihaela366]

Tom Geri

[@AussieBIMGuru]

Not quite sure what that means, but thanks anyway!