spatial-bit

# USD create camera and set attributes

import omni.usd
from pxr import UsdGeom, Gf, Usd, UsdGeom, Vt, Sdf

stage = omni.usd.get_context().get_stage()
camera = UsdGeom.Camera.Define(stage, f'/Motions/my_camera0')
camera.CreateClippingRangeAttr().Set((1,1000000)) # e.g. (1, 1000000)
# camera.AddTransformOp().Set(tx)

spatial-bit

# how to do references to multiple files
import omni.usd
from pxr import UsdGeom

stage = omni.usd.get_context().get_stage()
sphere = stage.OverridePrim('/my_prim')
sphere.GetReferences().AddReference('./HelloWorld0.usda')
sphere.GetReferences().AddReference('./HelloWorld1.usda')