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Puzzle 20: Explanation

Explore how Python context managers function using the with statement to manage resources like files and locks. Understand the role of __enter__ and __exit__ methods, including how exceptions like ZeroDivisionError can be suppressed, enhancing your ability to handle resource management and exceptions in Python code.

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Try it yourself

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Python 3.8
class timer:
    def __init__(self, name):
        self.name = name
    def __enter__(self):
        ...  
    def __exit__(self, exc_type, exc_value, traceback):
        result = 'OK' if exc_type is None else 'ERROR'
        print(f'{self.name} - {result}')
        return True
with timer('div'):
    1 / 0

Explanation

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