Iterating over lists in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print each fruit in the list.

Python

fruits = ['apple', 'banana', 'cherry']
for [1] in fruits:
    print([1])

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Afruit

Bfruits

Citem

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using the list name instead of a variable for each element.

Using a reserved word like 'list' as a variable.

We use a variable name to represent each element in the list during the loop. Here, fruit is the variable that takes each value from fruits.

2fill in blank

medium

Complete the code to sum all numbers in the list.

Python

numbers = [1, 2, 3, 4]
total = 0
for num in numbers:
    total += [1]
print(total)

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Anum

Bnumbers

Ctotal

Dnumber

Attempts:

3 left

💡 Hint

Common Mistakes

Adding the whole list instead of one number.

Using a variable that is not defined in the loop.

Inside the loop, num represents each number from the list. We add it to total to get the sum.

3fill in blank

hard

Fix the error in the loop to print each character in the word.

Python

word = 'hello'
for [1] in word:
    print(char)

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Aword

Bstring

Cletter

Dchar

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name in the loop and print.

Using the whole string as the loop variable.

The loop variable should be char because the print statement uses char. This way, each character is printed.

4fill in blank

hard

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

Python

words = ['cat', 'house', 'tree', 'a', 'dog']
lengths = { [1]: [2]([1]) for [1] in words if len([1]) > 3 }

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Aword

Blen

Clength

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using a non-existent function like length() or size().

We use word as the variable for each item in the list. The function len() gives the length of each word.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys and their lengths as values for words longer than 2 letters.

Python

words = ['hi', 'hello', 'yes', 'no']
result = { [1]: [2] for [3] in words if len([3]) > 2 }

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Aword.upper()

Blen(word)

Cword

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing variable names in the loop and dictionary.

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

word is the loop variable. We use word.upper() as the key and len(word) as the value in the dictionary.