jin-bo Matplotlib Charts
Format
- One chart per question. No subplots unless the user asks.
figsize=(10, 6); keep labels readable.- Save as PNG with
plt.savefig(path, dpi=120, bbox_inches="tight"). - Do not call
plt.show()— the environment is headless (MPLBACKEND=Agg).
Style
- Default matplotlib style is fine; avoid exotic third-party themes.
- Set a clear title, x/y labels, and rotate x ticks if labels overlap.
Return contract
After saving the chart, your FINAL assistant message must include exactly one line:
[CHART] chart-<slug>.png
The host UI parses this marker to render the image. Do not wrap it in code fences, backticks, or quotes.
Example
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
fig, ax = plt.subplots(figsize=(10, 6))
ax.bar(products, revenues)
ax.set_title("Revenue by product")
ax.set_ylabel("Revenue ($)")
plt.savefig("chart-revenue.png", dpi=120, bbox_inches="tight")
Then end your reply with:
[CHART] chart-revenue.png