List length and membership test in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the length of the list.

Python

numbers = [1, 2, 3, 4, 5]
print(len([1]))

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

Alist

Bnumbers

Clen

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the number 5 inside len() instead of the list variable.

Using the word 'list' instead of the list variable name.

The len() function returns the number of items in a list. Here, we want the length of the numbers list.

2fill in blank

medium

Complete the code to check if the number 3 is in the list.

Python

fruits = ['apple', 'banana', 'cherry']
if [1] in fruits:
    print('Found it!')

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

A'3'

B'banana'

C3

D'cherry'

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for the number 3 instead of a fruit name.

Using quotes incorrectly or missing quotes around the string.

We check if the string 'cherry' is in the list fruits. The in keyword tests membership.

3fill in blank

hard

Fix the error in the code to correctly check if 'cat' is in the list.

Python

animals = ['dog', 'cat', 'bird']
if 'cat' [1] animals:
    print('Cat found!')

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

Ain

Bnot in

Cis in

Dcontains

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'is in' or 'contains' which cause syntax errors.

Using 'not in' which checks the opposite condition.

The correct keyword to check membership is in. The phrase is in or contains are not valid Python syntax.

4fill in blank

hard

Fill both blanks to create a dictionary with words as keys and their lengths as values, but only for words longer than 3 letters.

Python

words = ['sun', 'moon', 'star', 'sky']
lengths = { [1] : [2] for word in words if len(word) > 3 }

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Aword

Blen(word)

Cword.upper()

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.upper() or word.lower() as keys instead of the original word.

Using the word variable as value instead of its length.

The dictionary comprehension uses each word as the key and its length len(word) as the value. The condition filters words longer than 3 letters.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys, their lengths as values, but only include words with length greater than 3.

Python

words = ['tree', 'sky', 'river', 'sun']
result = { [1] : [2] for [3] in words if len([3]) > 3 }

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

Aword.upper()

Blen(word)

Cword

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Not converting words to uppercase for keys.

Using the wrong variable in the condition.

The dictionary comprehension uses word.upper() as keys, len(word) as values, and iterates over word in the list. The condition filters words longer than 3 letters.