Why context managers are needed in Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a file for reading.

Python

with open('file.txt', [1]) as f:
    content = f.read()

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

A'r'

B'x'

C'a'

D'w'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'w' instead of 'r' which overwrites the file.

Forgetting to specify mode, which defaults to 'r' but is better to be explicit.

The mode 'r' opens the file for reading, which is the default and safe for reading content.

2fill in blank

medium

Complete the code to ensure the file is closed automatically after reading.

Python

with open('file.txt', 'r') as [1]:
    data = [1].read()

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

Aopen

Bfile

Cf

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'open' which is a function, not a variable.

Using 'read' which is a method, not a variable.

The variable 'f' is commonly used as the file object inside the with statement.

3fill in blank

hard

Fix the error in the code to properly handle file closing.

Python

f = open('file.txt', 'r')
content = f.read()
f.[1]()

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

Awrite

Bopen

Cread

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to close the file causing resource leaks.

Calling 'open()' again instead of 'close()'.

Calling 'close()' on the file object ensures the file is properly closed after use.

4fill in blank

hard

Fill both blanks to create a dictionary of word lengths only for words longer than 3 letters.

Python

lengths = {word: [1] for word in words if len(word) [2] 3}

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

Alen(word)

B<=

C>

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' instead of '>' causing wrong filtering.

Using 'word' instead of 'len(word)' for values.

We want the length of each word (len(word)) and only include words longer than 3 letters (len(word) > 3).

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values greater than 0.

Python

result = [1]: [2] for k, v in data.items() if v [3] 0}

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

Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'k' instead of 'k.upper()' for keys.

Using '<' instead of '>' for filtering.

Keys are converted to uppercase with k.upper(), values are v, and we filter values greater than 0 with '>'.