What are context managers in Python and how do I use them?

What are context managers in Python and how do I use them?

Context managers in Python are used to manage resources, ensuring they are properly acquired and released. You can use them with the with statement.

Can you give me an example of a context manager?

Sure! A common example is opening a file. You can use with open('file.txt') as f: to open a file, and it will automatically close it after the block.

What happens if an error occurs while using a context manager?

If an error occurs, the context manager will still ensure that resources are released properly, like closing a file.

How can I create my own context manager?

You can create your own context manager by defining a class with __enter__ and __exit__ methods, or by using the contextlib module.