Text alignment options in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the horizontal alignment of the text to center.

Matplotlib

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Hello', ha=[1])
plt.show()

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

A'right'

B'left'

C'justify'

D'center'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'left' or 'right' instead of 'center' for centering text.

The ha parameter controls horizontal alignment. Using 'center' centers the text horizontally.

2fill in blank

medium

Complete the code to set the vertical alignment of the text to top.

Matplotlib

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Top aligned', va=[1])
plt.show()

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

A'top'

B'center'

C'bottom'

D'baseline'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bottom' or 'center' instead of 'top' for vertical alignment.

The va parameter controls vertical alignment. Using 'top' aligns the text to the top.

3fill in blank

hard

Fix the error in the code by choosing the correct horizontal alignment value.

Matplotlib

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Error fix', ha=[1])
plt.show()

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

A'middle'

B'centre'

C'center'

D'centre-align'

Attempts:

3 left

💡 Hint

Common Mistakes

Using British spelling 'centre' instead of 'center'.

Using non-existent values like 'middle' or 'centre-align'.

The correct horizontal alignment value is 'center'. Other options are invalid and cause errors.

4fill in blank

hard

Fill both blanks to center the text horizontally and align it vertically at the baseline.

Matplotlib

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Aligned Text', ha=[1], va=[2])
plt.show()

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

A'center'

B'baseline'

C'top'

D'left'

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up horizontal and vertical alignment values.

Using 'top' instead of 'baseline' for vertical alignment.

Use 'center' for horizontal alignment and 'baseline' for vertical alignment to align text properly.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps words to their lengths only if the length is greater than 3.

Matplotlib

words = ['data', 'science', 'ai', 'ml']
lengths = { [1] : [2] for [3] in words if len([3]) > 3 }

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

Aword

Blen(word)

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using the word variable as value instead of length.

The dictionary comprehension uses word as the key and len(word) as the value, iterating over word in words.

Practice

1. In matplotlib, which parameter controls the horizontal alignment of text relative to its (x, y) position?

easy

A. va

B. ha

C. align

D. position

Solution

1. Step 1: Understand text alignment parameters

   Matplotlib uses 'ha' for horizontal alignment and 'va' for vertical alignment.

2. Step 2: Identify horizontal alignment parameter

   The parameter 'ha' stands for horizontal alignment, controlling left, center, or right placement.

3. Final Answer:

   ha -> Option B

4. Quick Check:

   Horizontal alignment = ha [OK]

Hint: Remember 'h' in 'ha' means horizontal [OK]

Common Mistakes:

• Confusing 'ha' with 'va'
• Using 'align' which is not a valid parameter
• Assuming 'position' controls alignment

2. Which of the following is the correct way to set vertical alignment to 'top' in matplotlib's text() function?

easy

A. plt.text(x, y, 'label', va='top')

B. plt.text(x, y, 'label', ha='top')

C. plt.text(x, y, 'label', valign='top')

D. plt.text(x, y, 'label', vertical='top')

Solution

1. Step 1: Recall vertical alignment parameter

   Vertical alignment is controlled by 'va' in matplotlib's text function.

2. Step 2: Check correct syntax for setting 'top'

   Using va='top' correctly sets vertical alignment to top.

3. Final Answer:

   plt.text(x, y, 'label', va='top') -> Option A

4. Quick Check:

   Vertical alignment = va [OK]

Hint: Use 'va' for vertical alignment, not 'ha' or others [OK]

Common Mistakes:

• Using 'ha' instead of 'va' for vertical alignment
• Using non-existent parameters like 'valign' or 'vertical'
• Misspelling parameter names

3. What will be the horizontal alignment of the text in this code snippet?

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, 'Center', ha='center', va='bottom')
plt.show()

medium

A. Center aligned

B. Right aligned

C. Left aligned

D. Justified

Solution

1. Step 1: Analyze the 'ha' parameter in the code

   The code sets ha='center', which means horizontal alignment is centered on the x position.

2. Step 2: Understand the effect of ha='center'

   The text will be horizontally centered at x=0.5 on the plot.

3. Final Answer:

   Center aligned -> Option A

4. Quick Check:

   ha='center' means center aligned [OK]

Hint: ha='center' means text is centered horizontally [OK]

Common Mistakes:

• Confusing 'ha' with 'va' and expecting vertical alignment
• Assuming default alignment is left
• Thinking 'ha'='center' means justified

4. Identify the error in this matplotlib code snippet:

import matplotlib.pyplot as plt
plt.text(0.3, 0.7, 'Hello', ha='middle', va='center')
plt.show()

medium

A. va parameter should be 'middle' instead of 'center'

B. Missing plt.show() call

C. Incorrect order of parameters

D. Invalid value 'middle' for ha parameter

Solution

1. Step 1: Check valid values for 'ha'

   Valid 'ha' values are 'left', 'center', and 'right'. 'middle' is invalid.

2. Step 2: Verify other parameters and syntax

   va='center' is valid, plt.show() is present, and parameter order does not matter.

3. Final Answer:

   Invalid value 'middle' for ha parameter -> Option D

4. Quick Check:

   ha must be left, center, or right [OK]

Hint: Use only 'left', 'center', or 'right' for ha [OK]

Common Mistakes:

• Using 'middle' instead of 'center' for ha
• Thinking parameter order matters
• Ignoring error messages about invalid parameter values

5. You want to place a label exactly at the top-right corner of a plot using plt.text(). Which combination of ha and va will correctly align the text so that the label's top-right corner is at the given (x, y) coordinates?

hard

A. ha='left', va='bottom'

B. ha='center', va='center'

C. ha='right', va='top'

D. ha='right', va='bottom'

Solution

1. Step 1: Understand alignment relative to (x, y)

   ha='right' aligns the text's right edge to x, va='top' aligns the text's top edge to y.

2. Step 2: Match alignment to top-right corner placement

   To place text so its top-right corner is at (x, y), use ha='right' and va='top'.

3. Final Answer:

   ha='right', va='top' -> Option C

4. Quick Check:

   Right and top align text corner to (x, y) [OK]

Hint: Right + top aligns text's top-right corner [OK]

Common Mistakes:

• Using ha='left' or va='bottom' which aligns opposite corners
• Assuming center alignment places corner at (x, y)
• Mixing up horizontal and vertical alignment parameters