Unable to delete Line

[lyflyflxf]

I'm using python 3.6 and ezdxf 0.15.1 processing a DXF file generated by UG NX 12.0 under windows 7 and windows 10.

I tried to delete all LINE objects, with code
`doc = ezdxf.readfile(path)
msp = doc.modelspace()
for entity in msp:
if entity.dxftype().lower()=='line':
msp.delete_entity(entity)

for entity in msp:
print(entity.dxftype())`

Then with print, I found out that some objects are still LINEs. I wouldn't have noticed this if doc.save() had not raised the exception "AttributeError: 'Line' object has no attribute 'dxf' "

Why did this happen?

[mozman]

Most likely, the model space contains block references (INSERT) that contain LINE entities.

PS: upgrade your Python version, the next ezdxf version requires at least Python 3.7

[lyflyflxf]

Thanks. I solved this by avoiding producing blocks in the DXF, because I failed to delete all blocks by deleting all INSERT entities. Besides, some LINE entities cannot be deleted either. What can I do to delete them?

P.S. I will upgrade my Python later.