S by Shilpa on 5 Jul 2021, edited 8 Jan 2024 #

Hi

I have two questions regarding the attached IFC file.

How to extract all the property sets from IFC file?

The code I tried is

import ifcopenshell.util

import ifcopenshell.util.element

ifc_file = ifcopenshell.open(input file)

products = ifc_file.by_type('IfcFlowSegment')[0]

line1= ifcopenshell.util.element.get_psets(products)

print (line1)

The output

{'12d Model': {'Geometry': {'id': 60, 'type': 'IfcComplexProperty', 'Name': 'Geometry', 'Description': '12d_attribute_group', 'UsageName': None, 'properties': {'Justification': 'Obvert', 'Start x': 51931.177, 'Start y': 158115.545, 'Start z': 3.403, 'End x': 51923.207, 'End y': 158110.611, 'End z': 3.656}}, 'PUP': {'id': 68, 'type': 'IfcComplexProperty', 'Name': 'PUP', 'Description': '12d_attribute_group', 'UsageName': None, 'properties': {'ID': 'SBCP-L181120-00011025', 'Owner': 'BCC', 'Description': 'PIPE', 'Creator': 'B+B', 'Creation Date': '20181126', 'Creation Source': 'SURVEY', 'AS 4588 Quality': 'B', 'Comment': 'nc', 'Material': 'STEEL'}}, 'Label': {'id': 78, 'type': 'IfcComplexProperty', 'Name': 'Label', 'Description': '12d_attribute_group', 'UsageName': None, 'properties': {'PipeSize': 'Ø100'}}}}

How can I Iterate so that all the property sets are extracted?

How can I get the properties in the above output into a dataframe?

M by Moult on 6 Jul 2021 #

The code you've written already extracts all the property sets. I guess your question is how to iterate through the dictionary. Try this (untested):


psets = ifcopenshell.util.element.get_psets(products)


def print_properties(properties):

    for name, value in properties.items():

        if isinstance(value, dict):

            print(name, 'Complex')

            print_properties(value)

        else:

            print(name, value)


for name, properties in psets.items():

    print('Pset Name', name)

    print_properties(properties)

From this, hopefully you can work out how to get it into data frames.

S by Shilpa on 6 Jul 2021 #

I tried the above code

Below is the error message I got:

___**failed to load properties: 'list' object has no attribute 'is_a'

Traceback (most recent call last):

File "C:\Users\Shilpa\anaconda3\envs\myenv\lib\site-packages\ifcopenshell\util\element.py", line 4, in get_psets

if element.is_a("IfcTypeObject"):

AttributeError: 'list' object has no attribute 'is_a'**___

It worked when I gave the index value [0]

**products = ifc_file.by_type('IfcFlowSegment')[0]

psets = ifcopenshell.util.element.get_psets(products)**

How can I iterate through the file and extract all the property sets?

S by Shilpa on 8 Jul 2021 #

I could iterate using the for loop

Thanks for sharing the code.

M by Moult on 8 Jul 2021 #

Cheers, glad you got it resolved!

P by polsonmila on 22 Nov 2021 #

Dear Moult and Shilpa, I have tried the codes above on IfcWall and IfcSlab (using an IFC2x3 model). I only get an error message. Please help.

Below is my screen shot.

P by polsonmila on 22 Nov 2021 #

I used this IFC model

E by Einar on 22 Nov 2021 #

get_pset() expects a single element and got a list of walls. Try to get a sigle wall with something like ´get_psets(my_walls[0])´ or a loop.

P by polsonmila on 22 Nov 2021 #

I am grateful for the help

After reading through the https://wiki.osarch.org/index.php?title=IfcOpenShell_code_examples

I was able to at least use the sample code to extract the wall pset as dictionary.

1 These are the imports I am using

import ifcopenshell

import ifcopenshell.util

from ifcopenshell.util.selector import Selector

from ifcopenshell import util

import ifcopenshell.util.pset

import ifcopenshell.util.element

import pandas as pd

2 The IFC file I am using as attached

ifc = ifcopenshell.open('Duplex3.ifc')

selector = Selector()

3 The walls and slab using the by_type function

walls = ifc.by_type('IfcWall')

slabs = ifc.by_type('IfcSlab')

4 The iterations for the psets I did.

for wall in my_walls:

wall_details = wall.get_info()

for wall in walls:

pset_wall = ifcopenshell.util.element.get_psets(wall)

NOTE: I am trying to extract the quantities of Walls and Slabs and place them in a dataframe.

I want these to have their GUID.

I would also like to group all the Walls external walls based on their Cardinal points (south, north, etc)

once again thank you for your anticipated responses.

P by polsonmila on 22 Nov 2021 #

@Shilpa said:

I could iterate using the for loop

Thanks for sharing the code.

@Shilpa please kindly assist me.

G by ghesselink on 3 Jan 2024, edited 3 Jan 2024 # +1 votes

A bit outdated, but perhaps useful for someone.

What worked for me was (not sure how to format functions here properly)

>  def get_properties(inst):

>         def get_recursive_props(psets):

 >       properties = {}

>        for name, value in psets.items():

>            if isinstance(value, dict):

>                properties[name] = get_recursive_props(value)

 >           else:

 >               properties[name] = value

>        return properties

>    return get_recursive_props(ifcopenshell.util.element.get_psets(inst))

This function can then be called with any ifcopenshell.entity_instance, e.g.

properties = get_recursive_props(wall)

The dictionary can then be flattened and converted to a dataframe with something like

def flatten(d):

items = []

for k, v in d.items():

 if isinstance(v, dict):

>        items.append((k, 'Complex'))

   >     for inner_key, inner_value in v.items():

      >      items.append((inner_key, inner_value))

    >else:

    >    items.append((k, v))

> return dict(items)

> df = pd.DataFrame([flatten(properties])

A by Andrej730 on 8 Jan 2024 # +1 votes

@ghesselink hi! you can format your code with markdown syntax:


properties = get_recursive_props(wall)

G by ghesselink on 8 Jan 2024 #

I seem to not be able to edit my own post. I didn't realise you can use markdown here.

The answer with markdown:

A bit outdated, but perhaps useful for someone.

What worked for me was (not sure how to format functions here properly)


def get_properties(inst):

         def get_recursive_props(psets):

             properties = {}

             for name, value in psets.items():

                  if isinstance(value, dict):

                      properties[name] = get_recursive_props(value)

                  else:

                       properties[name] = value

                   return properties

              return get_recursive_props(ifcopenshell.util.element.get_psets(inst))

This function can then be called with any ifcopenshell.entity_instance, e.g.


properties = get_recursive_props(wall)

The dictionary can then be flattened and converted to a dataframe with something like


def flatten(d):

    items = []

     for k, v in d.items():

        if isinstance(v, dict):

           items.append((k, 'Complex'))

           for inner_key, inner_value in v.items():

                items.append((inner_key, inner_value))

        else:

            items.append((k, v))

            return dict(items)

df = pd.DataFrame([flatten(properties])

OSArch Community

How to extract the property sets from IFC file

1 These are the imports I am using

2 The IFC file I am using as attached

3 The walls and slab using the by_type function

4 The iterations for the psets I did.