How do I write a context manager

A context manager in Python is a construct that helps manage resource allocation and deallocation, ensuring that resources are properly cleaned up after their use. This is often achieved through the usage of the `with` statement. Context managers are particularly useful for managing file streams and network connections.

context manager, python, with statement, resource management, cleanup, file handling
This content explains how to create and use a context manager in Python, including a practical example.

Here is an example of a simple context manager that opens a file and ensures it is properly closed after its use:

# Python code example class MyContextManager: def __enter__(self): # Setup code, e.g., open a file self.file = open('example.txt', 'w') return self.file def __exit__(self, exc_type, exc_val, exc_tb): # Cleanup code, e.g., close the file self.file.close() with MyContextManager() as file: file.write('Hello, World!')

context manager python with statement resource management cleanup file handling

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