Individual subplot customization in Matplotlib - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of subplot title customization

What will be the title of the second subplot after running this code?

Matplotlib

import matplotlib.pyplot as plt
fig, axs = plt.subplots(1, 2)
axs[0].set_title('First Plot')
axs[1].set_title('Second Plot')
plt.close(fig)
print(axs[1].get_title())

A Second Plot

B First Plot

C Plot 2

D null

💡 Hint

Check which subplot index is used to set the title.

The code sets the title of axs[1] to 'Second Plot'. The print statement outputs this exact string.

❓ data_output

intermediate

Number of ticks on customized subplot

After running this code, how many x-axis ticks will the first subplot display?

Matplotlib

import matplotlib.pyplot as plt
fig, axs = plt.subplots(2, 1)
axs[0].set_xticks([0, 1, 2, 3])
axs[1].set_xticks([0, 1])
plt.close(fig)
print(len(axs[0].get_xticks()))

A 4

B 2

C 5

D 3

💡 Hint

Count the number of positions passed to set_xticks for the first subplot.

The first subplot has ticks set at [0,1,2,3], so it will have 4 ticks.

❓ visualization

advanced

Identify subplot with customized grid style

Which subplot will display a dashed grid after running this code?

Matplotlib

import matplotlib.pyplot as plt
fig, axs = plt.subplots(1, 3)
axs[0].grid(true, linestyle='--')
axs[1].grid(true, linestyle=':')
axs[2].grid(true, linestyle='-')
plt.close(fig)
print([axs[i].get_xgridlines()[0].get_linestyle() for i in range(3)])

A First subplot

B Second subplot

C Third subplot

D null of them

💡 Hint

Look at the linestyle argument passed to grid for each subplot.

The first subplot uses linestyle='--' which is dashed. The others use dotted ':' and solid '-'.

🔧 Debug

advanced

Identify error in subplot label customization

What error will this code raise when customizing subplot labels?

Matplotlib

import matplotlib.pyplot as plt
fig, axs = plt.subplots(2, 2)
axs[0].set_xlabel('X axis')
axs[1].set_ylabel('Y axis')
axs[4].set_title('Invalid subplot')
plt.close(fig)

A IndexError

B AttributeError

C TypeError

D No error

💡 Hint

Check the index used to access axs array.

axs is a 2x2 array, so valid indices are 0 to 3. axs[4] is out of range causing IndexError.

🚀 Application

expert

Customize individual subplot background colors

Given this code, which option correctly sets the background color of the middle subplot to light gray?

Matplotlib

import matplotlib.pyplot as plt
fig, axs = plt.subplots(1, 3)
# Customize background color here
plt.close(fig)

A axs[1].set_facecolor('lightgray')

B axs[1].set_background('lightgray')

C axs[1].facecolor = 'lightgray'

D axs[1].background_color('lightgray')

💡 Hint

Use the correct method to set the axes background color.

The correct method to set the background color of a subplot is set_facecolor(). Other options are invalid or do not exist.