I noticed it might be useful to gather some Python related posts in one thread to make it easy to get started with some basic understanding (and also for a consultation ease purpose). This is still a work in progress and there might be some slight inconsistencies. Feel free to add your own links or Python related comments, or to PM me on anything that should be revised. This first post relates naturally to tips for LEARNING PYTHON: http://dynamoprimer.com/en/09_Custom-Nodes/9-4_Python.html http://dynamoprimer.com/en/09_Custom-Nodes/9-5_Python-Revit.html http://dynamoprimer.com/en/12_Best-Practice/12-1_Scripting-Strategies.html http://dynamoprimer.com/en/12_Best-Practice/12-3_Scripting-Reference.html http://dynamoprimer.com/en/Appendix/A-1_resources.html [image] Python Nodes Basics Share I wrote a 30 page handout for my AU class on Python for Dynamo, thought I would leave this here [image] Python 0.6.3 to 0.7.x Migration Open Source Graphical Programming for Design. Contribute to DynamoDS/Dynamo development by creating an account on GitHub. [image] Python in dynamo FAQ [image] Python! Packages If you want to learn Python to work with the Revit API, best start here: http://wiki.theprovingground.org/revit-api. If you're looking for a more general introduction you could start at http://www.learnpython.org or http://www.pythonforbeginners.com. And here's a list with a few more resources: https://wiki.python.org/moin/BeginnersGuide/NonProgrammers. [image] Learning Python basics in Dynamo Developers My suggestion is to buy a intro-level Python book, read this article: https://github.com/DynamoDS/Dynamo/wiki/Python-0.6.3-to-0.7.x-Migration and generally open Clockwork, Archi-lab, spring nodes, Rhytmn packages and others and see what is going on under the hood! Good luck! slight_smile [image] Learning Python basics in Dynamo Developers This site, that popped up recently, has a lot of thoroughly explained dynamo/python examples: [image] PYTHON - creating nodes Packages Preetesh- I was in your situation a few months ago (February) , so I know how you feel right now. All I can do is tell you how I went about learning. Get a good book on Python basics or go to http://learnpythonthehardway.org/ Assuming you are looking to integrate with Revit - download the Revit SDK and get comfortable using the Revit API chm help file. Download some of the better packages available (Clockwork, Grimshaw, etc), open up their nodes, look at the python scripts, and force … [image] ***Beginners Guide to Python*** Developers Hi @bikashseas Below are the links for Python learning resources which includes videos and books. https://docs.python.org/2/tutorial/ http://www.ironpythoninaction.com/download.html https://pythonprogramming.net/ http://wiki.theprovingground.org/system:page-tags/tag/python [image] GitHub - gtalarico/python-revit-resources: List of Resources for Python-Revit... List of Resources for Python-Revit Lovers. Contribute to gtalarico/python-revit-resources development by creating an account on GitHub. [image] C# for Zero Touch Tutorials Developers Honestly, not a lot for basic stuff, and if your using packages that are written in IronPython, most of it can be ported with practically no effort. However it’s a strong-typed language and requires more configuration and know-how compared to Python (installing Visual Studio, creating the correct project, loading the API dll’s etc) which makes it un-forgiving if you’ve never coded before. My advice would be to use Python. Its very easy to learn, you can readily examine the code written by other… [image] How to use Revit SDK? Revit I can suggest to have a look to this course online https://www.lynda.com/Dynamo-Studio-tutorials/Dynamo-Revit-Python-Scripting/647661-2.html It is perfect to start and learn together Python and Revit API… Good luck! [image] Python Scripting Video Course Share The PyRevit youtube channel is another great resource for Revit focused python learning: However you should keep in mind that those videos are targeting the Revit python shell, which is implemented slightly differently from the Dynamo equivalent. (different ways to call the active document; no need to worry about element wrapping, because you’re not returning anything to the graph; etc.) [image] Python Nodes Basics Share It seems consistent to add this other nice tutorial here:

This third post is about REVIT API and C# TO PYTHON: Revit API Forum - Autodesk Community Welcome to Autodesk’s Revit API Forums. Share your knowledge, ask questions, and explore popular Revit API topics. Revit API 2017.1 Online Documentation for Autodesk's Revit API: 2015, 2016, 2017, 2017.1, 2018 Revit API Docs - Code Samples Online Documentation for Autodesk's Revit API: 2015, 2016, 2017, 2017.1, 2018 Revit API Docs - Code Samples Online Documentation for Autodesk's Revit API: 2015, 2016, 2017, 2017.1, 2018 http://thebar.cc/converting-revit-api-c-code-to-python/ Autodesk empowers innovators everywhere to make the new possible Autodesk is a global leader in design and make technology, with expertise across architecture, engineering, construction, design, manufacturing, and entertainment. http://thebuildingcoder.typepad.com/blog/about-the-author.html [image] How to select and understand the Library? Developers Hello Rajkumar! This article explains a lot when it comes to how dynamo works with the revit api: https://github.com/DynamoDS/Dynamo/wiki/Python-0.6.3-to-0.7.x-Migration#revitapi The Revit API uses .NET assemblies to give access to functionalities in the program, these assemblies are .dll files. RevitAPI.dll and RevitAPIUI.dll are files that can be found in the Revit program folder. To use .NET with python Dynamo uses a variant called IronPython. How clr and clr.AddReference work is explained… [image] Plugin to Python Code Developers Maybe you can try @Dimitar_Venkov s C# interpreter: (found in the package manager). I just slightly edited the code to include some references and swapped to Dynamos document manager. [image] //Add references using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Autodesk.Revit.DB; using Autodesk.Revit.DB.Structure; using Autodesk.Revit.UI; using Autodesk.Revit.UI.Selection; using Autodesk.Revit.ApplicationServices; using Auto… [image] Zero Touch - How to return list of elements Developers That return statement looks good and it seems to be doing what it’s supposed to inside Dynamo. Tho I’m not sure why you’re generating new lists instead of using the existing lists? I guess your question is how to return a Dynamo element instead? You’ll need to wrap the Revit element like so: types.Add(doc.GetElement(id).ToDSType(true) ) You could also give the new C# interpreter a try. It’s up on the package manager: [image] [image] Testing Explicit C# Nodes Without Restarting Revit If you’re testing something specific, you could always give my Dynamic CSharp Interpreter a go: [image] You can find it on the package manager [image] Casting in Python Because C# is a strongly typed language you have to specify the type for every variable. That’s why it needs casting to a LocationCurve. Python on the other hand does the casting for you, so in this case you should be able to do something like this: curve = l.Curve Because you ask for .Curve property on a Location object Python will figure out that it needs to cast to LocationCurve and then return the Curve. [image] Revit API & python relations Developers Hi sajo We know it’s overwhelming, but you are more likely to get quick responses if you break these questions down into separate posts/subjects. In any case, I will try to touch on some of the points: What does the first four similar lines of every script do…? See comments below import clr # imports Common Language Runtime library .This will serve as a bridge between python and the .NET wold # See this: http://ironpython.net/documentation/dotnet/dotnet.html clr.AddReference('Proto…

@Yna_Db Give a man a fish and he can eat for a day. Give a man a fishingrod and he can eat for a lifetime. Thnx Marcel

Totally agree :slight_smile: This post relates to IRONPYTHON and its LIBRARIES: http://ironpython.net/ http://www.ironpython.info/index.php?title=Useful_Links http://opensimulator.org/git/opensim-libs-save/IronPython/IronPython-1.1.1/Tutorial/Tutorial.htm https://ironpython-test.readthedocs.io/en/latest/ [johnc] Python or IronPython python, ironpython, cpython asked by johnc on 10:41AM - 26 Feb 09 UTC [Benjamin Karlog] Python vs Iron Python python, ironpython asked by Benjamin Karlog on 07:46AM - 13 Jun 13 UTC https://ironpython-test.readthedocs.io/en/latest/library/index.html https://docs.python.org/2/library/intro.html http://ironpython.net/documentation/dotnet/ [image] Ironpython Standard Library Modules That’s because some modules are implemented using native c# libs and reside in the IronPythonModules.dll, which is loaded automatically at startup. The rest of the ipy modules are implemented as python code (and reside in the Lib folder) and are translated to the CLR’s intermediate language every time you run the script: [DynamoSandbox_2017-10-31_09-43-12] [image] Networkx library in Dynamo Developers Cesare, There are couple of things in play here. Hopefully this link helps to explain a little bit: https://stackoverflow.com/a/17130986/3263488 [image] ImportError: No module named fractions Developers Hi @Adrian_Crisan You have to add the default ironpython library to the interpreter’s path. Not sure why it’s not added by default (maybe @Dimitar_Venkov can shed some light?), but this should work: [image]

This post is a selection of COMMENTED SCRIPTS: Revit API Docs - Code Samples Online Documentation for Autodesk's Revit API: 2015, 2016, 2017, 2017.1, 2018 [image] Set analytical column Z Projection parameter Revit Yna_Db is correct, it’s read only and you need to use the SetProjection Method in a python node. Here is an example of how to use the method: element.SetProjection(AnalyticalElementSelector.EndOrTop, StickElementProjectionY.LocationLine, StickElementProjectionZ.Bottom) Here is a complete working code: [image] import clr # Import Revit API clr.AddReference('RevitAPI') from Autodesk.Revit.DB import * from Autodesk.Revit.DB.Structure import * # Import DocumentManager and TransactionManager c… [image] Set analytical column Z Projection parameter Revit @James_Washbourne Here are the relevant sections from revitapidocs: http://www.revitapidocs.com/2018/9351c377-8b05-503f-3cce-f60af42e9def.htm http://www.revitapidocs.com/2018/174346c5-e7f3-58f1-1495-3836c9f973e3.htm If you want to add the Enumerations as string inputs you can use the Enum.Parse method. [image] import clr import System # Import Revit API clr.AddReference('RevitAPI') from Autodesk.Revit.DB import * from Autodesk.Revit.DB.Structure import * # Import DocumentManager and Trans… [image] Location of rebar Revit I found another script I had written once, but forgotten about. Think it does what you want: [image] import clr clr.AddReference('RevitAPI') from Autodesk.Revit.DB import * from Autodesk.Revit.DB.Structure import * clr.AddReference('RevitNodes') import Revit clr.ImportExtensions(Revit.GeometryConversion) clr.ImportExtensions(Revit.Elements) clr.AddReference('RevitServices') import RevitServices from RevitServices.Persistence import DocumentManager doc = DocumentManager.Instance.CurrentDBDo… [image] Convert All Selected Linked Elements to Parts Revit It was just random for debugging purposes. I believe the CreateParts method returns null. If you need to return the parts, I think you have to use PartUtils.GetAssociatedParts() Yes, the script would be even easier if you can get the elements from an IN-port. Just replace the filtered element collector with IN[1] or something similar. Here is a modified version of the script: import clr clr.AddReference('RevitAPI') from Autodesk.Revit.DB import * clr.AddReference('System') from System.Coll… [image] Crop Region by curve Developers try this: http://dp-stuff.org/room-plans-non-rectangular-viewports-revit-2014/ [image] #dp Stuff | http://dp-stuff.org | createRoomPlanViews #this Revit Python Script batch generates Room Plan Views #before running the script select the rooms to generate Plan Views for import clr import math clr.AddReference('RevitAPI') clr.AddReference('RevitAPIUI') from Autodesk.Revit.DB import * clr.AddReference('RevitServices') import RevitServices from RevitServices.Persistence import DocumentManage… [image] Set View Range Parameters Revit Here’s an easier to copy paste version of the code slight_smile import clr clr.AddReference('RevitAPI') from Autodesk.Revit.DB import* clr.AddReference('RevitServices') from RevitServices.Persistence import DocumentManager from RevitServices.Transactions import TransactionManager doc = DocumentManager.Instance.CurrentDBDocument views = UnwrapElement(IN[0]) ltop = UnwrapElement(IN[1]) toffset = IN[2] lbottom = UnwrapElement(IN[3]) boffset = IN[4] count = 0 TransactionManager.Instance.Ensur… [image] Material Paint Multiple Wall Surfaces Lists-Logic Probably easiest to say that just about everything directly related to how your trying to paint the walls is not correct. Here’s a script that I wrote a while back for the same kind of thing that you can look at and try to evaluate how it differs from yours. This isn’t the most robust script as it will fail if you don’t have a list (single object), or you have a multi-dimensional list, or if you have a face based wall, but it should be enough to get the point across. [PaintWalls_python] -Tim

Totally agree, but the main problem in the forum is that some users are still doing the work of some lazy people. Regards,

@Organon I can’t resist to cite your very first lesson to coding in this thread 'cause I simply love it :grinning: [image] Organizer Folder in Project Browser - Views Revit for users in users: if screenshot is None: print ("This is not a 'do my work' forum.") elif codeSample is None: print ("This is not a 'do my work' forum.") elif DYNfile is None or RVTfile is None: print ("This is not a 'do my work' forum.") else: print ("Ok, let's see your question.")

@Yna_Db, Hahaha, it’s the hard truth. Regards,

[image] Organon: the hard truth … so much easier to say with a touch of humor :grin:

To complement this IF-ELSE STATEMENT proposal, here are a few additional examples: https://forum.dynamobim.com/t/if-list-is-empty-switch-to-another-list/14720/6 [image] How to write simple "if elif else" conditional in Python Developers layer = IN[0] styles=[] for i in layer: if i == "red" : styles.append("0.13mm") elif i == "yellow": styles.append ("0.18mm") else : styles.append ("0.13mm") OUT = styles https://forum.dynamobim.com/t/wall-property-function/11685/9 https://forum.dynamobim.com/t/msgbox-and-if-statement/12993/13 [image] Python Script, Processing a List Developers you are indeed. Your code only works on a singleton (i.e. one object, or in your case, a number). As you want to provide a list you need to store your result in a list and iterate over the input list. One method is a simple loop to iterate through the list (and python has some pretty powerful built-in itertools which you should check out on python.org which are more efficient than loops): import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * #The inputs to th… [image] Python If Statement for beginner? Developers Can some one tell me what I’m doing wrong here?. [image] [image] Filled Region By Curves Error Share Just luckily solved it myself slight_smile if anyone has the same issue here’s my solution [Capture] Python # Assign curves to groups according to whether they are connected via shared start points and end points. Group numbers are not important. # Colin McCrone, 2015-09-28 import clr import math clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * # Determine whether two points are equal def PointsEqual(pt1, pt2): tolerance = 0.00001 if (math.fabs(pt1.X …

The following posts are related to PYTHON LISTS: [image] Running Node on Several Background Opened Files @staylor You have to iterate over your list of documents using a for loop. Right now you are defining doc as a list, so essentially in line 18 you are saying param_list = ListObject.FamilyManager.GetParameters() See below example, when I query the object type of the input without a for loop, it shows me the object is a list. If I query the object type of the input elements with the for loop, it returns the object type of the items in the list [iterateoverdocs] So, you need to put your code w… [image] Select Pinned Elements Revit Hi @Jordan_Billingsley - I already have a very simple Python script that accomplishes supplying a boolean output for whether or not elements are pinned are not, which I will provide below. You can use this inputting your wall elements, then using Filter.ByBoolMask with its output. To encourage you to understand how the script works & to further learn using Python with the Revit API I will provide an explanation on how it works. if you look at the API Docs that @Nick_Boyts referenced above you w… [image] Algorithm for sublist in python Developers There’s probably a cleaner way of doing this but a simple use of append will work. import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * clr.AddReference('DSCoreNodes') from DSCore import * #The inputs to this node will be stored as a list in the IN variables. dataEnteringNode = IN items = IN[0] inlist = IN[1] newlist = [] for indices in inlist: sublist = [] for i in indices: sublist.append(items[i]) newlist.append(sublist) #Assign your output to the O… [image] Python Error output Developers Strange. Works fine on my end. Have you tried closing the file and re-running it? [image] [image] Stuck with a python logic Lists-Logic As an FYI, you should paste your Python code using the Preformatted Text option. Just highlight your pasted text and click in the toolbar above. Yes, but I don’t think that’s what you need here. As @awilliams said, you can wrap your if statement within your for loop. However, if you wanted to iterate through both lists simultaneously you would use: for i, j in zip(list1, list2): This would essentially get you paired values list1[0]/list2[0], list1[1]/list2[1], etc. [image] Inserting element into list with python Developers [image] https://forum.dynamobim.com/t/lacing-on-replacing-item-on-index/16462/11 https://forum.dynamobim.com/t/help-with-group-by-key/11379/8 [image] Setting Revision Visibility with Python - RevisionVisibility Enumeration Members Developers I have noticed that this before too, and it looks like UnwrapElement() is converting the Pyton List into a Collections.Generic.List. That’s why isintance() returns false. [image] [image] List Merge Lists-Logic @Cesar_Escalante Using Python, option 1: [image] def MergeSort(lst1,lst2): MergedList=[] for index,i in enumerate(lst1): MergedList.append(i+lst2[index]) MergedList[index].sort() return MergedList OUT=MergeSort(IN[0],IN[1]) Option 2: [image] MergedList=[i+IN[1][index] for index,i in enumerate(IN[0])] for i in MergedList: i.sort() OUT=MergedList [image] How to create ElementSet from list of elements in Dynamo hi @andre.abotnes [image] [image] Automatic dimensioning of (multiple) detail lines Revit Hi JN, Have you tried setting the lacing of the custom node that you created to Longest? Otherwise you could use a for loop in Python: import clr clr.AddReference('RevitAPI') from Autodesk.Revit.DB import * clr.AddReference("RevitNodes") import Revit clr.ImportExtensions(Revit.Elements) clr.ImportExtensions(Revit.GeometryConversion) clr.AddReference("RevitServices") import RevitServices from RevitServices.Persistence import DocumentManager from RevitServices.Transactions import TransactionM… [image] New list with largest value among sublists ; Python, Lists Lists-Logic the function works with nulls as well : [image] we take each element among sublists and then find largest i’m not sure I got this part [image] Use the Flatten node in python script DesignScript @ Hannes - use List Comprehensions - they are much faster than loops: import clr clr.AddReference(‘ProtoGeometry’) from Autodesk.DesignScript.Geometry import * dataEnteringNode = IN[0] OUT = [i for sublist in IN[0] for i in sublist] https://docs.python.org/2/tutorial/datastructures.html [image] Crop Region by curve Developers Nice that you got it to work! If you wanted to combine the lists in python you could have used zip() for view,curves in zip(views,curvelist): #Create curveloop loop = CurveLoop() for c in curves: loop.Append(c.ToRevitType()) #Set cropregion in Transaction TransactionManager.Instance.EnsureInTransaction(doc) view.CropBoxActive = True view.GetCropRegionShapeManager().SetCropShape(loop) outputlist.append(view) TransactionManager.Instance.TransactionTaskDone() OUT = outputlist [image] Iterate over lists Lists-Logic I am guessing you have 2 sublists and really what you’re asking is how can you perform cross product lacing with sublist 1 against sublist 2? Try this (this only works on a list with two sublists; if you are trying to match each item from sublist 1 with all items with sublist 2, then match each item from sublist 2 with all items from sublist 3…etc then this wont work and you should think about how to manage your data better) import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScri… [image] How to Handle Variable Input List Length/Nesting in Custom Nodes (Python) Developers The Konrad’s function using lists comprehension: elements = IN[0] ProcessLists = lambda function, lists: [ProcessLists(function, item) if isinstance(item, list) else function(item) for item in lists] sum = lambda x: x + 1 if isinstance(elements, list): out = ProcessLists(sum, elements) else: out = sum(elements) OUT = out [image] [image] Applying Lineloads in Dynamo from element Revit Try using a definition like so above your inputs… def tolist(obj1): if hasattr(obj1,“iter”): return obj1 else: return [obj1] And for the input beams write the following… beams = tolist(UnwrapElement(IN[0])) This is what I use for inputs to ensure they are an iterable object. Very common point of failure in writing python nodes. (I can’t seem to format the code on my mobile, but indented code after the first line naturally) [image] Different ways of getting element Ids Developers Hi @salvatoredragotta Both versions get the ElementId using the same method, which is the .Id Property (any object that inherits from Element has it). What’s different, is what they do with the resulting ElementId objects retrieved. The method you use, will depend what you will do with the collection of ElementIds. More details below. The 2nd in your example, creates a list (built-in Python list) which is a generic, container native to Python, the other creates a List, a .NET data-type. Pyt… [stdmn] Revit API & Dynamo, Handling Variable Input Types revit-api, revitpythonshell asked by stdmn on 10:09PM - 19 Feb 16 UTC

Python Nodes Basics

Yna_Db October 24, 2017, 8:13pm 8

@Organon
I can’t resist to cite your very first lesson to coding in this thread 'cause I simply love it

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Python Nodes Basics

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