Custom legend entries in Matplotlib - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of creating custom legend entries in matplotlib?

Custom legend entries allow you to add specific labels and symbols to the legend that may not directly correspond to plotted data, helping to explain or highlight important information clearly.

beginner

Which matplotlib class is commonly used to create custom legend handles?

The <code>matplotlib.patches.Patch</code> class is often used to create custom legend handles with specific colors and labels.

intermediate

How do you add a custom legend entry without plotting a new line or marker?

You create a custom handle (like a Patch or Line2D object) and pass it along with a label to the legend() function using the handles and labels parameters.

intermediate

What is the role of Line2D in custom legend entries?

Line2D can be used to create custom line or marker styles for legend entries, especially when you want to show a line or marker that is not part of the plotted data.

beginner

True or False: Custom legend entries can only represent colors, not shapes or line styles.

False. Custom legend entries can represent colors, shapes, line styles, and markers by using appropriate matplotlib objects like Patch or Line2D.

Which parameter do you use to specify custom legend handles in matplotlib?

A markers

B labels

C colors

D handles

The handles parameter is used to pass custom legend entries (like patches or lines) to the legend.

What matplotlib object would you use to create a colored box for a custom legend entry?

A Patch

B Line2D

C Figure

D Axes

Patch objects create colored shapes like boxes or rectangles for legend entries.

If you want to add a custom legend entry showing a dashed line, which object is best to use?

A Patch

B Text

C Line2D

D Scatter

Line2D can create custom line styles such as dashed lines for legend entries.

Can you add a legend entry that does not correspond to any plotted data?

A No, legend entries must match plotted data

B Yes, by creating custom handles

C Only if you plot invisible data

D Only with special matplotlib plugins

You can add custom legend entries by creating handles manually without plotting data.

Which function is used to display the legend in matplotlib?

A plt.legend()

B plt.plot()

C plt.show()

D plt.title()

plt.legend() displays the legend on the plot.

Explain how to create and add a custom legend entry in matplotlib without plotting new data.

Think about creating a shape or line object and passing it to legend.

Describe the difference between using Patch and Line2D for custom legend entries.

Consider what visual element you want to show in the legend.