ifcopenshell - bcf library

M by mcnill on 10 Nov 2022, edited 11 Nov 2022 #

Hi all,

my first post here, so hello everbody!

While searching for bcf python libraries i've found the library within the ifcopenshell repo.

Wasn't aware of that... :)

I copied this folder to my site-packages folder:

https://github.com/IfcOpenShell/IfcOpenShell/tree/v0.7.0/src/bcf/src/bcf

Is that correct or is it necessary to install an other way?

I'm asking because i got an error when importing the bcfxml module.

Any help welcome!

Cheers

Marcus

M by Moult on 11 Nov 2022 #

That's correct, you may need some other dependencies like xsdata. What's the error you're getting?

M by mcnill on 11 Nov 2022 #

The xsdata module is already installed.

_from bcf.bcfxml import load

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "C:\Users\nillma\AppData\Roaming\Python\Python38\site-packages\bcf\bcfxml.py", line 25, in <module>

from bcf.v2.bcfxml import BcfXml as BcfXml2

File "C:\Users\nillma\AppData\Roaming\Python\Python38\site-packages\bcf\v2\bcfxml.py", line 8, in <module>

import bcf.v2.model as mdl

File "C:\Users\nillma\AppData\Roaming\Python\Python38\site-packages\bcf\v2\model__init__.py", line 1, in <module>

from bcf.v2.model.markup import (

File "C:\Users\nillma\AppData\Roaming\Python\Python38\site-packages\bcf\v2\model\markup.py", line 7, in <module>

**@dataclass**(slots=True, kw_only=True)

TypeError: dataclass() got an unexpected keyword argument 'slots'_

M by mcnill on 11 Nov 2022 #

I found the cause of the error. I'm using Python 3.8.8 and Python 3.10 seems to be is neccesary.

The dataclass module in P 3.10 has enhanced keywords.

Unlucky me since my CAD uses embedded Python 3.8.8.

:)

M by Moult on 11 Nov 2022 #

@mcnill oh dear, we actually had a debate on whether or not we should support older Python versions, and we concluded that for stuff like bcf since it was relatively new we decided not to bother with legacy support. BTW if you want a BCF that does support older versions, you can jump back in commit history to like a month ago and use the old BCF system, it lacks a few neat features (mostly speed increases from I/O minimisation) from the new one but is functional.

M by mcnill on 11 Nov 2022 #

@Moult Thank you for your response!

I'll have a look into the older version.