How to edit AutoCAD Layer Description using ezdxf

Question

I want to know how to edit AutoCAD's Layer Description property.

I have referenced the ezdxf documentation but I do not know how.

Please tell me an example of how to use it.

Answer 1

The Layer Description in AutoCAD is stored within the Extended Entity Data (xData) of the Layer Table record, associated with the second occurrence of DXF group 1000 under the AcAecLayerStandard Application ID.

As such, you should be able to configure the layer description using ezdxf using something along the lines of the following:

import ezdxf

dwg = ezdxf.readfile('C:\YourFilename.dxf')
lay = dwg.layers.get('YourLayerHere')
app = 'AcAecLayerStandard'
dsc = 'YourDescriptionHere'

if lay.tags.has_xdata(app):
    lay.tags.set_xdata(app, [(1000, ''), (1000, dsc)])
else:
    dwg.appids.new(app)
    lay.tags.new_xdata(app, [(1000, ''), (1000, dsc)])

The above is entirely untested.