Label, title, and axis names in Matplotlib - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the title of the plot?

Consider this code that creates a simple plot with matplotlib. What will be the title shown on the plot?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6])
plt.title('Sales Over Time')
plt.xlabel('Month')
plt.ylabel('Revenue')
plt.show()

A Sales

B Revenue

C Sales Over Time

D Month

💡 Hint

Look for the function that sets the main heading of the plot.

The plt.title() function sets the main title of the plot. Here, it is set to 'Sales Over Time'.

❓ Predict Output

intermediate

What label appears on the y-axis?

Look at this code snippet. What label will appear on the y-axis of the plot?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([10, 20, 30], [1, 4, 9])
plt.xlabel('Time (s)')
plt.ylabel('Distance (m)')
plt.title('Motion Data')
plt.show()

A Time (s)

B Distance (m)

C Motion Data

D Speed (m/s)

💡 Hint

The y-axis label is set by the function that starts with 'ylabel'.

The plt.ylabel() function sets the label for the y-axis. Here, it is 'Distance (m)'.

🔧 Debug

advanced

Why does this code not show the x-axis label?

This code is supposed to show a plot with an x-axis label, but the label does not appear. What is the reason?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [3, 2, 1])
plt.xlabel('Time')
plt.title('Sample Plot')
plt.show()

A The x-axis label is set correctly and will appear as 'Time'.

B The plot command is missing, so no plot is shown.

C The plt.xlabel() function is called after plt.show(), so it does not update the plot.

D The x-axis label is not shown because plt.title() overrides it.

💡 Hint

Check the order of commands and what plt.show() does.

The plt.xlabel() is called before plt.show(), so the label 'Time' will appear on the x-axis. The code is correct.

❓ visualization

advanced

Identify the axis labels and title from the plot

Given this code, what are the x-axis label, y-axis label, and title of the plot?

Matplotlib

import matplotlib.pyplot as plt
x = [0, 1, 2, 3]
y = [0, 1, 4, 9]
plt.plot(x, y)
plt.xlabel('Input')
plt.ylabel('Output')
plt.title('Quadratic Growth')
plt.show()

A x-axis: Input, y-axis: Output, title: Quadratic Growth

B x-axis: Output, y-axis: Input, title: Quadratic Growth

C x-axis: Input, y-axis: Quadratic Growth, title: Output

D x-axis: Quadratic Growth, y-axis: Output, title: Input

💡 Hint

Look at the functions plt.xlabel(), plt.ylabel(), and plt.title().

plt.xlabel('Input') sets the x-axis label, plt.ylabel('Output') sets the y-axis label, and plt.title('Quadratic Growth') sets the plot title.

🧠 Conceptual

expert

What happens if you call plt.xlabel() twice with different labels before plt.show()?

If you run this code, what will be the label shown on the x-axis?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [3, 2, 1])
plt.xlabel('First Label')
plt.xlabel('Second Label')
plt.title('Test Plot')
plt.show()

A No x-axis label will appear because of the conflict.

B The x-axis label will be 'First Label'.

C Both labels will appear on the x-axis.

D The x-axis label will be 'Second Label'.

💡 Hint

Think about what happens when you set the same property twice.

Calling plt.xlabel() twice sets the label twice. The last call overwrites the first, so 'Second Label' is shown.