Applying /COPILOT_GENERATE suggestion doesn't

[MartinDelille]

The /COPILOT_GENERATE prompt create sometimes bad edit and I wondered if there was a kind of way to fix this.

For example, I have this simple gameoflife.py file:

import matplotlib.animation as animation
import matplotlib.pyplot as plt
import numpy as np

ON = 255
OFF = 0
vals = [ON, OFF]


def random_grid(N):
    return np.random.choice(vals, N * N, p=[0.2, 0.8]).reshape(N, N)


def update(frameNum, img, grid, N):
    newGrid = grid.copy()
    for i in range(N):
        for j in range(N):
            total = int(
                (
                    grid[i, (j - 1) % N]
                    + grid[i, (j + 1) % N]
                    + grid[(i - 1) % N, j]
                    + grid[(i + 1) % N, j]
                    + grid[(i - 1) % N, (j - 1) % N]
                    + grid[(i - 1) % N, (j + 1) % N]
                    + grid[(i + 1) % N, (j - 1) % N]
                    + grid[(i + 1) % N, (j + 1) % N]
                )
                / ON
            )
            if grid[i, j] == ON:
                if (total < 2) or (total > 3):
                    newGrid[i, j] = OFF
            else:
                if total == 3:
                    newGrid[i, j] = ON
    img.set_data(newGrid)
    grid[:] = newGrid[:]
    return (img,)


def main():
    N = 100
    updateInterval = 50
    grid = random_grid(N)
    fig, ax = plt.subplots()
    img = ax.imshow(grid, interpolation="nearest")
    ani = animation.FuncAnimation(
        fig,
        update,
        fargs=(img, grid, N),
        frames=10,
        interval=updateInterval,
        save_count=50,
    )
    plt.show()


if __name__ == "__main__":
    main()

The following prompt result in the following answer:

## User ───

/COPILOT_GENERATE Change the game color theme.

## Copilot ───

[file:gameoflife.py](gameoflife.py) line:47-47
```python
47:     img = ax.imshow(grid, interpolation="nearest", cmap="viridis")
```

When applied with Ctrl+y, the 47: prefix is inserted. Is there a way to prevent this ?

[deathbeam]

Try using claude 3.5 if you arent using it, that one was most reliable for me for generating code

[MartinDelille]

Ok thanks it indeed works best for this example!

[deathbeam]

Claude is generally just best for anything coding related so would recommend sticking with it, downside is that its noticeably slower than gpt-4o but thats about it

[MartinDelille]

I set it as default in my CopilotChat config.