05. Markers & Data Points

While lines represent smooth trends, markers pinpoint the exact locations where discrete data observations were collected.

Mental Model Intuition

Push-pins stuck into specific coordinate coordinates on a corkboard chart.

Common Marker SymbolsSymbols

'o' (circle), 's' (square), '^' (triangle up), 'v' (triangle down), 'D' (diamond), '*' (star), 'x' (cross), '.' (small point).

Pair distinct markers with distinct colors to ensure your plots remain readable for color-blind viewers or when printed in grayscale.

plt.plot(x, y, marker='^', markersize=10)

Marker Edge & Face ColorsCustomization

`markerfacecolor` (or `mfc`) and `markeredgecolor` (or `mec`) customize interior and border colors.

White-filled markers with colored borders (`mfc='white', mec='#6366F1'`) produce a sleek minimalist aesthetic.

plt.plot(x, y, marker='o', mfc='white', mec='#6366F1', ms=8)

Avoid the top errors and bad plotting practices that trip up new Python developers

Troubleshooting

`marker` specifies point geometry ('o', 's', '^', '*').
`markersize` (or `ms`) sets marker diameter.
`markerfacecolor` (`mfc`) and `markeredgecolor` (`mec`) style inner and border colors.

Topic 5 • Python IDE

Python 3.12 • Matplotlib

Presets:

Ctrl + Enter to run

Run Python code to inspect terminal output.

Switch from abstract numbers to relatable Cricket, Cinema & Business charts

5 Curated Datasets

+50 XP

Write Matplotlib code to solve the objective and see your live plot render

Objective Instructions:

Plot `x=[1, 2, 3]` and `y=[4, 7, 3]` using star marker `marker='*'` with `markersize=12` and `color='#FF5C7A'`.

Required Keywords:✓ marker✓ markersize

Challenge Code Editor

Challenge Output GraphLive Vector Preview

Write code on the left to render live challenge plot

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