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Oppiskele Using the with Statement | Understanding Context Managers
Python Context Managers

bookUsing the with Statement

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# Using the with statement to work with a file with open("sample.txt", "w") as file: file.write("Learning context managers in Python!")
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The with statement is a powerful feature in Python that simplifies resource management by automatically handling the setup and cleanup of resources. In the code sample above, you use the open function, which returns a file object that acts as a context manager. When you write with open("sample.txt", "w") as file:, Python calls the file object's __enter__ method when entering the block, assigning the open file to the variable file. Inside the block, you can safely write to the file. When the block ends, whether normally or through an exception, Python automatically calls the file object's __exit__ method to close the file. This approach prevents common mistakes like forgetting to close files, making your code safer and more readable. The with statement works with any object that implements the context management protocol, which includes the __enter__ and __exit__ methods.

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Fill in the blanks to complete the code that writes "Hello, Context Managers!" to a file using the with statement and a context manager.

open("hello.txt", "w") as f: f.("Hello, Context Managers!")

Click or drag`n`drop items and fill in the blanks

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bookUsing the with Statement

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123
# Using the with statement to work with a file with open("sample.txt", "w") as file: file.write("Learning context managers in Python!")
copy

The with statement is a powerful feature in Python that simplifies resource management by automatically handling the setup and cleanup of resources. In the code sample above, you use the open function, which returns a file object that acts as a context manager. When you write with open("sample.txt", "w") as file:, Python calls the file object's __enter__ method when entering the block, assigning the open file to the variable file. Inside the block, you can safely write to the file. When the block ends, whether normally or through an exception, Python automatically calls the file object's __exit__ method to close the file. This approach prevents common mistakes like forgetting to close files, making your code safer and more readable. The with statement works with any object that implements the context management protocol, which includes the __enter__ and __exit__ methods.

question-icon

Fill in the blanks to complete the code that writes "Hello, Context Managers!" to a file using the with statement and a context manager.

open("hello.txt", "w") as f: f.("Hello, Context Managers!")

Click or drag`n`drop items and fill in the blanks

Oliko kaikki selvää?

Miten voimme parantaa sitä?

Kiitos palautteestasi!

Osio 1. Luku 2
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