Alpha transparency for overlap in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the transparency of the scatter plot points.

Matplotlib

import matplotlib.pyplot as plt

plt.scatter([1, 2, 3], [4, 5, 6], alpha=[1])
plt.show()

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

A1.5

B0.5

C-0.3

D'0.5'

Attempts:

3 left

💡 Hint

Common Mistakes

Using alpha values greater than 1 or less than 0 causes errors.

Passing alpha as a string instead of a number.

The alpha parameter controls transparency and must be between 0 (fully transparent) and 1 (fully opaque). 0.5 sets half transparency.

2fill in blank

medium

Complete the code to plot two overlapping scatter plots with transparency.

Matplotlib

import matplotlib.pyplot as plt

plt.scatter([1, 2, 3], [4, 5, 6], alpha=[1], color='red')
plt.scatter([2, 3, 4], [5, 6, 7], alpha=0.3, color='blue')
plt.show()

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

A0.8

B2

C-1

D'0.8'

Attempts:

3 left

💡 Hint

Common Mistakes

Using alpha values outside the 0-1 range.

Passing alpha as a string.

Setting alpha to 0.8 makes the red points slightly transparent so overlapping with blue points is visible.

3fill in blank

hard

Fix the error in the code to correctly apply transparency to the scatter plot.

Matplotlib

import matplotlib.pyplot as plt

plt.scatter([1, 2, 3], [4, 5, 6], alpha=[1])
plt.show()

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

A'0.5'

B2

C0.5

D-0.5

Attempts:

3 left

💡 Hint

Common Mistakes

Passing alpha as a string causes a TypeError.

Using values outside the 0-1 range causes ValueError.

Alpha must be a float between 0 and 1, not a string or invalid number.

4fill in blank

hard

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

Matplotlib

words = ['data', 'ai', 'science', 'ml']
lengths = {word: [1] for word in words if [2]

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Alen(word)

Blen(word) > 3

Cword

Dword > 3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself instead of its length as the value.

Checking if the word (string) is greater than 3 instead of length.

The dictionary comprehension maps each word to its length only if the length is greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase words to their lengths only if length is greater than 4.

Matplotlib

words = ['apple', 'data', 'science', 'ai']
result = [1]: [2] for w in words if [3]

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Aw.upper()

Blen(w)

Clen(w) > 4

Dw.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using w.lower() instead of w.upper() for keys.

Not filtering words by length correctly.

The comprehension creates a dictionary with uppercase words as keys and their lengths as values, filtering words longer than 4 characters.