Text alignment options in Matplotlib - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the horizontal alignment of the text?

Consider the following matplotlib code snippet. What is the horizontal alignment of the text 'Hello' on the plot?

Matplotlib

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Hello', ha='right')
plt.close()

A The text is aligned to the right of the specified position.

B The text is centered horizontally on the specified position.

C The text is aligned to the left of the specified position.

D The text alignment is default and depends on the matplotlib version.

💡 Hint

The parameter 'ha' controls horizontal alignment: 'left', 'center', or 'right'.

The 'ha' parameter set to 'right' means the text's right edge is at the specified x coordinate.

❓ Predict Output

intermediate

What vertical alignment does this code produce?

Given this matplotlib code, what vertical alignment is applied to the text 'Data'?

Matplotlib

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Data', va='top')
plt.close()

A The text alignment is baseline by default.

B The text is aligned so its top is at the y position.

C The text is aligned so its bottom is at the y position.

D The text is aligned so its center is at the y position.

💡 Hint

The 'va' parameter controls vertical alignment: 'top', 'center', 'bottom', or 'baseline'.

Setting va='top' aligns the top of the text at the given y coordinate.

❓ visualization

advanced

Identify the text alignment from the plot

This plot shows three texts with different horizontal and vertical alignments. Which text is centered both horizontally and vertically?

Matplotlib

import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.text(0.2, 0.5, 'Left-Bottom', ha='left', va='bottom')
ax.text(0.5, 0.5, 'Center-Center', ha='center', va='center')
ax.text(0.8, 0.5, 'Right-Top', ha='right', va='top')
plt.close()

A The text at x=0.2, y=0.5

B The text at x=0.8, y=0.5

C None of the texts are centered both horizontally and vertically.

D The text at x=0.5, y=0.5

💡 Hint

Look for ha='center' and va='center' in the code.

The text at (0.5, 0.5) uses ha='center' and va='center', so it is centered horizontally and vertically.

❓ data_output

advanced

Count texts with right horizontal alignment

Given this list of matplotlib text objects with different horizontal alignments, how many have 'ha' set to 'right'?

Matplotlib

import matplotlib.text as mtext
texts = [mtext.Text(0,0,'A', ha='left'), mtext.Text(0,0,'B', ha='right'), mtext.Text(0,0,'C', ha='center'), mtext.Text(0,0,'D', ha='right')] 
count_right = sum(1 for t in texts if t.get_ha() == 'right')
print(count_right)

A 3

B 1

C 2

D 4

💡 Hint

Count how many text objects have ha='right'.

Two text objects have ha='right': 'B' and 'D'.

🧠 Conceptual

expert

Which alignment combination places text exactly centered on a point?

In matplotlib, to place text exactly centered on a point (x, y), which combination of horizontal and vertical alignment should be used?

A ha='center' and va='center'

B ha='left' and va='bottom'

C ha='right' and va='top'

D ha='center' and va='baseline'

💡 Hint

Centering means the text's middle aligns with the point horizontally and vertically.

Using ha='center' and va='center' aligns the text's center exactly at the point.