How can I add arc tracks to my PCB layout in KiCad using Python?
Adding arc tracks to a PCB layout in KiCad can be done using Python scripting. The script provided demonstrates adding an arc track between two pads, creating a 90-degree arc with a specific radius:

```python
import pcbnew
import math
from pcbnew import wxPoint, wxPointMM

def add_track_arc(start, mid, end, layer=pcbnew.F_Cu):
    board = pcbnew.GetBoard()
    track = pcbnew.PCB_ARC(board)
    track.SetStart(start)
    track.SetMid(mid)
    track.SetEnd(end)
    track.SetWidth(int(0.25 * 1e6))
    track.SetLayer(layer)
    board.Add(track)

# Example of adding arc track
board = pcbnew.GetBoard()
# ... (rest of the script to define start, end, and mid points)
add_track_arc(start1, mid, end1)

pcbnew.Refresh()
```

This script is ideal for creating curved tracks on PCBs, which can be necessary for certain design constraints or aesthetic preferences.