Basic pie chart with plt.pie in Matplotlib - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the plt.pie() function in matplotlib?

The plt.pie() function creates a pie chart, which is a circular graph divided into slices to show proportions of different categories.

beginner

Which parameter in plt.pie() specifies the sizes of each slice?

The first parameter, usually a list or array, specifies the sizes (values) of each slice in the pie chart.

beginner

How can you add labels to each slice in a pie chart using plt.pie()?

Use the labels parameter and pass a list of strings to name each slice.

intermediate

What does the autopct parameter do in plt.pie()?

The autopct parameter formats and displays the percentage value on each slice, e.g., '%.1f%%' shows one decimal place.

intermediate

Why is it important to call plt.axis('equal') after plt.pie()?

Calling plt.axis('equal') makes sure the pie chart is drawn as a circle instead of an ellipse, keeping proportions accurate.

What type of chart does plt.pie() create?

A Pie chart

B Bar chart

C Line chart

D Scatter plot

plt.pie() creates a pie chart, which shows parts of a whole as slices.

Which parameter adds labels to pie chart slices?

A explode

B sizes

C colors

D labels

The labels parameter adds names to each slice.

How do you show percentage values on pie slices?

A Use <code>labels</code>

B Use <code>autopct</code>

C Use <code>colors</code>

D Use <code>explode</code>

The autopct parameter formats and shows percentages on slices.

What does plt.axis('equal') do after plotting a pie chart?

A Changes colors

B Explodes slices

C Makes pie circular

D Adds labels

It ensures the pie chart is a perfect circle, not an ellipse.

Which of these is NOT a parameter of plt.pie()?

A xlabel

B sizes

C autopct

D labels

xlabel is for axis labels, not used in pie charts.

Explain how to create a basic pie chart using plt.pie() including how to add labels and percentages.

Think about the main inputs needed to show parts of a whole clearly.

Why is it important to use plt.axis('equal') after plotting a pie chart?

Consider the shape of the pie chart and how it affects visual accuracy.