Automatic resource cleanup in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a file using a context manager.

Python

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

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

A'open'

B'r'

C'write'

D'close'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write' instead of 'r' causes the file to open for writing, which may overwrite content.

Using 'open' or 'close' as mode strings are invalid.

The mode 'r' opens the file for reading, which is the default and correct here.

2fill in blank

medium

Complete the code to automatically close the file after reading.

Python

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

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

Afile

Bread

Copen

Df

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'open' or 'read' as variable names causes errors.

Using 'f' is common but here 'file' matches the code below.

The variable name after 'as' is used to refer to the file object inside the block.

3fill in blank

hard

Fix the error in the code to ensure the file is closed automatically.

Python

file = open('log.txt', 'r')
try:
    content = [1].read()
finally:
    file.close()

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

Afile

Bopen

Cread

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'open.read()' causes an error because open is a function, not the file object.

Using 'read.read()' or 'close.read()' are invalid.

The variable 'file' holds the file object and must be used to call read().

4fill in blank

hard

Fill both blanks to create a dictionary with word lengths for words longer than 3 characters.

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 '>' filters shorter words.

Using 'word' instead of len(word) gives the word itself, not its length.

We use len(word) to get the length and '>' to filter words longer than 3 characters.

5fill in blank

hard

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

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()' keeps keys as original case.

Using '<' instead of '>' filters values less than zero.

Using 'k' or 'v' incorrectly in keys or values.

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