I'm using python 3.10.6 and i get the error and PySDL2 0.9.13

invalid requirement: 'PySDL2=-0.9.6' (from like 3 of requirement.txt)
Hint: is not a valid operator. did you mean == ?

Check out parser.text_from.
It's probably struggling with the _lines attribute of namespaces

for filepath in sys.argv[1:]:
    base.world.solids = obj_solids("E:\New pc files\vmf_tool-master\tf2")
    with open("E:\New pc files\vmf_tool-master\tf2" + ".vmf", "w") as out_file:
        vmf_tool.export(base, out_file)

This is what I changed it to at the bottom

It also highlighted the ( from with open("E:\New pc files\vmf_tool-master\tf2" + ".vmf", "w") as out_file:

A method to check if a certain field is in a namespace (either singular or plural), and add a namespace to nest a namespace in another (Visgroup hierarchies, brush entities) & applying the plural system to keys which occur more than once in a namespace would all be very useful related methods

"connections" in test2.vmf could be modified by duplicating one of the lines.
The duplicate gets removed even if the value is not a duplicate.
Hammer editor allows multiple actions on a single entity "output".

I can provide a test that fails.

It may make sense to do something similar to https://github.com/birjolaxew/vmf-transpiler#multiple-values-per-key with a valueobject that actually expands to multiple keys when regenerating the vmf

Add a function / method that adds brushes from a box selection (vec3 min & max)

Procedural shapes:

• Pre-clipped stairs with pretty random texture offsets
• Arch
• Cylinder
• Spike

All with similar parameters to what the Hammer Editor offers