Legends and Colors
Legends
Legends are needed when you plot multiple series.
Legend
import matplotlib.pyplot as plt
x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [1, 2, 3, 4, 5]
plt.figure(figsize=(7, 4))
plt.plot(x, y1, label="square")
plt.plot(x, y2, label="linear")
plt.title("Two series")
plt.xlabel("x")
plt.ylabel("y")
plt.legend()
plt.tight_layout()
plt.show()Legend
import matplotlib.pyplot as plt
x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [1, 2, 3, 4, 5]
plt.figure(figsize=(7, 4))
plt.plot(x, y1, label="square")
plt.plot(x, y2, label="linear")
plt.title("Two series")
plt.xlabel("x")
plt.ylabel("y")
plt.legend()
plt.tight_layout()
plt.show()Colors
Use:
- high-contrast colors
- colorblind-friendly palettes when possible
- consistent color meaning across charts
Custom color
import matplotlib.pyplot as plt
plt.figure(figsize=(7, 4))
plt.plot([1, 2, 3], [3, 2, 5], color="#1f77b4")
plt.title("Custom color")
plt.tight_layout()
plt.show()Custom color
import matplotlib.pyplot as plt
plt.figure(figsize=(7, 4))
plt.plot([1, 2, 3], [3, 2, 5], color="#1f77b4")
plt.title("Custom color")
plt.tight_layout()
plt.show()Tip
Avoid using too many colors in one chart.
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