Font properties customization in Matplotlib - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the font size of the title in this plot?

Consider this matplotlib code that sets a title with a specific font size. What font size will the title text have?

Matplotlib

import matplotlib.pyplot as plt
plt.title('Sample Title', fontsize=18)
plt.plot([1, 2, 3], [4, 5, 6])
plt.show()

A 12

B 10

C 18

D 24

💡 Hint

Look at the fontsize argument inside plt.title.

The fontsize parameter in plt.title sets the font size of the title text. Here it is set to 18.

❓ data_output

intermediate

What font family is used in this text?

This code sets the font family of a label. What font family will the label text use?

Matplotlib

import matplotlib.pyplot as plt
plt.xlabel('X axis', fontfamily='serif')
plt.plot([1, 2], [3, 4])
plt.show()

A serif

B sans-serif

C cursive

D monospace

💡 Hint

Check the fontfamily argument in plt.xlabel.

The fontfamily parameter sets the font family. Here it is set to 'serif'.

❓ visualization

advanced

Which option produces a plot with bold and italic title text?

Given these four code snippets, which one will produce a plot with the title text both bold and italic?

A plt.title('Title', fontweight='bold', fontstyle='normal')

B plt.title('Title', fontweight='italic', fontstyle='bold')

C plt.title('Title', fontweight='normal', fontstyle='bold')

D plt.title('Title', fontweight='bold', fontstyle='italic')

💡 Hint

fontweight controls boldness, fontstyle controls italic style.

fontweight='bold' makes text bold, fontstyle='italic' makes text italic. Option D sets both correctly.

🔧 Debug

advanced

Why does this code raise an error?

This code tries to set font properties but raises an error. What is the cause?

Matplotlib

import matplotlib.pyplot as plt
plt.xlabel('X axis', fontweight=700)
plt.show()

A The code is correct and does not raise an error

B plt.xlabel does not accept fontweight argument

C fontweight should be set using plt.rcParams, not in xlabel

D fontweight must be a string like 'bold', not an integer

💡 Hint

fontweight accepts both strings (like 'bold') and integers (like 700).

The code is correct and does not raise an error. Matplotlib's fontweight accepts numeric values from 0-1000 (700 is bold) in addition to strings like 'bold'.

🚀 Application

expert

How to set different font properties for x and y axis labels in one plot?

You want the x-axis label to be italic and size 14, and the y-axis label to be bold and size 18. Which code snippet achieves this?

A

plt.xlabel('X axis', fontstyle='italic', fontweight='bold', fontsize=14)
plt.ylabel('Y axis', fontstyle='italic', fontweight='bold', fontsize=18)

B

plt.xlabel('X axis', fontstyle='italic', fontsize=14)
plt.ylabel('Y axis', fontweight='bold', fontsize=18)

C

plt.xlabel('X axis', fontweight='bold', fontsize=18)
plt.ylabel('Y axis', fontstyle='italic', fontsize=14)

D

plt.xlabel('X axis', fontsize=14)
plt.ylabel('Y axis', fontsize=18)

💡 Hint

Check the fontstyle and fontweight parameters for each label separately.

Option B correctly sets x label italic with size 14 and y label bold with size 18.