How can I add custom graphics like circles to my PCB layout in KiCad using Python?
To add custom graphics like circles to a PCB layout in KiCad using Python, you can create and position DRAWSEGMENT objects on the desired layer. The provided script includes an example of drawing circular silkscreen borders around a radial LED layout:

```python
import pcbnew

# Load the board and set scale
board = pcbnew.LoadBoard('copy.kicad_pcb')
SCALE = 1000000

# Define the center and radii for the circles
CENTER = (140, 95)
R1 = 1.0*25.4 # Inner radius
R2 = 2.00*25.4 # Outer radius

# Add circles to the silkscreen layer
# ... (code for adding circles)

board.Save('autogen.kicad_pcb')
```

This script adds two circular borders on the silkscreen layer, demonstrating how to include custom graphics in a PCB design.