Why legends and colorbars guide reading in Matplotlib - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a legend to the plot.

Matplotlib

import matplotlib.pyplot as plt

plt.plot([1, 2, 3], [4, 5, 6], label='Line 1')
plt.plot([1, 2, 3], [6, 5, 4], label='Line 2')
plt.[1]()  # Add legend
plt.show()

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

Alegend

Bcolorbar

Ctitle

Dxlabel

Attempts:

3 left

💡 Hint

Common Mistakes

Using colorbar() instead of legend()

Forgetting to add labels to the plot lines

Trying to use title() to show labels

The legend() function adds a legend to the plot, which helps identify different lines.

2fill in blank

medium

Complete the code to add a colorbar to the scatter plot.

Matplotlib

import matplotlib.pyplot as plt
import numpy as np

x = np.random.rand(50)
y = np.random.rand(50)
colors = np.random.rand(50)
scatter = plt.scatter(x, y, c=colors)
plt.[1](scatter)  # Add colorbar
plt.show()

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

Aylabel

Blegend

Cxlabel

Dcolorbar

Attempts:

3 left

💡 Hint

Common Mistakes

Using legend() instead of colorbar()

Not passing the scatter plot object to the colorbar() function

Trying to add xlabel or ylabel instead

The colorbar() function adds a color scale next to the plot, showing what colors represent.

3fill in blank

hard

Fix the error in the code to correctly add a legend with a title.

Matplotlib

import matplotlib.pyplot as plt

plt.plot([1, 2, 3], [3, 2, 1], label='Data')
plt.legend(title=[1])
plt.show()

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

A'Legend Title'

BLegend Title

C"Legend Title"

DLegend_Title

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the title text

Using a variable name without defining it

Using underscores instead of spaces without quotes

The title parameter needs a string, so it must be in quotes like "Legend Title".

4fill in blank

hard

Fill both blanks to create a scatter plot with a colorbar and label the colorbar.

Matplotlib

import matplotlib.pyplot as plt
import numpy as np

x = np.arange(10)
y = np.random.rand(10)
colors = np.linspace(0, 1, 10)
scatter = plt.scatter(x, y, c=colors, cmap='viridis')
cbar = plt.[1](scatter)
cbar.set_[2]('Intensity')
plt.show()

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

Acolorbar

Blegend

Clabel

Dtitle

Attempts:

3 left

💡 Hint

Common Mistakes

Using legend() instead of colorbar()

Using set_title() instead of set_label() for the colorbar

Not assigning the colorbar to a variable before labeling

Use colorbar() to add the color scale, then set_label() to name it.

5fill in blank

hard

Fill all three blanks to create a line plot with two lines, add a legend, and set the legend location.

Matplotlib

import matplotlib.pyplot as plt

x = [1, 2, 3, 4]
y1 = [10, 20, 25, 30]
y2 = [30, 23, 15, 10]
plt.plot(x, y1, label=[1])
plt.plot(x, y2, label=[2])
plt.[3](loc='upper left')
plt.show()

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

A'First Line'

B'Second Line'

Clegend

Dtitle

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around labels

Using title() instead of legend()

Forgetting to add labels to the plot lines

Labels must be strings in quotes; legend() adds the legend with location set.