Stacked bar charts in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a stacked bar chart using matplotlib.

Matplotlib

import matplotlib.pyplot as plt

labels = ['A', 'B', 'C']
values1 = [3, 5, 1]
values2 = [4, 2, 6]

plt.bar(labels, values1, label='Group 1')
plt.bar(labels, values2, bottom=[1], label='Group 2')
plt.legend()
plt.show()

Drag options to blanks, or click blank then click option'

Avalues1

Bvalues2

Clabels

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'values2' as bottom causes bars to overlap incorrectly.

Using 'labels' as bottom causes a type error.

The 'bottom' parameter in plt.bar specifies where the second bar starts. To stack bars, it should be the height of the first bar, which is 'values1'.

2fill in blank

medium

Complete the code to add colors to the stacked bars.

Matplotlib

import matplotlib.pyplot as plt

labels = ['X', 'Y', 'Z']
values1 = [2, 7, 4]
values2 = [5, 3, 6]

plt.bar(labels, values1, color=[1], label='First')
plt.bar(labels, values2, bottom=values1, color='orange', label='Second')
plt.legend()
plt.show()

Drag options to blanks, or click blank then click option'

A'yellow'

B'red'

C'blue'

D'green'

Attempts:

3 left

💡 Hint

Common Mistakes

Using color without quotes causes a NameError.

Using an invalid color name causes a ValueError.

The 'color' parameter accepts a color name as a string. Here, 'red' is used for the first bars.

3fill in blank

hard

Fix the error in the code to correctly stack three bars.

Matplotlib

import matplotlib.pyplot as plt

labels = ['P', 'Q', 'R']
values1 = [1, 4, 3]
values2 = [2, 5, 1]
values3 = [3, 2, 4]

plt.bar(labels, values1, label='One')
plt.bar(labels, values2, bottom=[1], label='Two')
plt.bar(labels, values3, bottom=[a+b for a,b in zip(values1, values2)], label='Three')
plt.legend()
plt.show()

Drag options to blanks, or click blank then click option'

Avalues1

Bvalues2

Cvalues1 + values2

Dlabels

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'values2' as bottom for the second bar causes overlap.

Using 'labels' as bottom causes a type error.

The second bar's bottom should be the height of the first bars, which is 'values1'. The third bar's bottom is the sum of the first and second bars, 'values1 + values2'.

4fill in blank

hard

Fill both blanks to create a stacked bar chart with labels and a title.

Matplotlib

import matplotlib.pyplot as plt

labels = ['Jan', 'Feb', 'Mar']
sales1 = [10, 15, 7]
sales2 = [5, 8, 12]

plt.bar(labels, sales1, color='blue', label='Online')
plt.bar(labels, sales2, bottom=[1], color='green', label=[2])
plt.xlabel('Month')
plt.title('Monthly Sales')
plt.legend()
plt.show()

Drag options to blanks, or click blank then click option'

Asales1

B'Offline'

C'Online'

Dsales2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sales2' as bottom causes bars to overlap incorrectly.

Using 'Online' as label for the second bar duplicates the first bar's label.

The second bar's bottom is the first bar's heights 'sales1'. The label for the second bar is 'Offline'.

5fill in blank

hard

Fill all three blanks to create a stacked bar chart with three groups and custom colors.

Matplotlib

import matplotlib.pyplot as plt

labels = ['East', 'West', 'North']
group1 = [4, 6, 5]
group2 = [3, 7, 2]
group3 = [5, 2, 4]

plt.bar(labels, group1, color=[1], label='Group 1')
plt.bar(labels, group2, bottom=[2], color=[3], label='Group 2')
plt.bar(labels, group3, bottom=[a+b for a,b in zip(group1, group2)], color='purple', label='Group 3')
plt.legend()
plt.show()

Drag options to blanks, or click blank then click option'

A'cyan'

Bgroup1

C'magenta'

Dgroup2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'group2' as bottom for the second bar causes overlap.

Using colors without quotes causes errors.

The first bar uses color 'cyan'. The second bar's bottom is the first group's heights 'group1'. The second bar's color is 'magenta'.