Stacked bar charts in Matplotlib - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a stacked bar chart?

A stacked bar chart shows parts of a whole by stacking bars on top of each other. Each bar segment represents a category's value, making it easy to compare totals and parts.

beginner

How do you create a stacked bar chart in matplotlib?

Use the bar() function multiple times with the 'bottom' parameter to stack bars. Each call adds a segment on top of the previous ones.

intermediate

Why use the 'bottom' parameter in matplotlib's bar() function?

The 'bottom' parameter sets where the bar segment starts vertically. It stacks the current bar on top of the previous bars by specifying their heights.

beginner

What is a good real-life example of stacked bar charts?

Showing sales of different product categories over months. Each bar is a month, and segments show category sales stacked to see total and parts.

beginner

How can colors help in stacked bar charts?

Colors distinguish different categories clearly. Using a legend with colors helps readers understand which segment belongs to which category.

What does the 'bottom' parameter do in matplotlib's bar() function?

A Sets the vertical start position of the bar segment

B Changes the bar color

C Sets the width of the bar

D Labels the bar segment

The 'bottom' parameter sets where the bar segment starts vertically, allowing stacking on previous bars.

Which chart type is best to show parts of a whole over categories?

A Stacked bar chart

B Line chart

C Scatter plot

D Pie chart

Stacked bar charts show parts of a whole across categories clearly.

In a stacked bar chart, what does each segment represent?

A The total value only

B The average value

C A part of the total value for a category

D The maximum value

Each segment shows a part of the total value for that category.

What matplotlib function is used to create bars in a bar chart?

A scatter()

B bar()

C plot()

D hist()

The bar() function creates bars in matplotlib.

Why is a legend important in stacked bar charts?

A It adds grid lines

B It changes the bar width

C It sorts the bars

D It explains which color represents which category

A legend helps readers identify categories by color.

Explain how to create a stacked bar chart using matplotlib's bar() function.

Think about stacking bars by setting where each starts vertically.

Describe a real-life situation where a stacked bar chart would be useful and why.

Think about comparing groups with multiple parts.