What are nested context managers in Python?

Can you explain what nested context managers are in Python?

Sure! Nested context managers allow you to manage multiple resources using the with statement in Python.

How do I use them in a code example?

Here's a simple example:

with open('file1.txt') as f1, open('file2.txt') as f2:
    data1 = f1.read()
    data2 = f2.read()

What happens if one of the files doesn't exist?

If one of the files doesn't exist, a FileNotFoundError will be raised, and the other file will not be opened.

Can I use nested context managers with custom classes?

Yes, you can! Just ensure your custom class implements the __enter__ and __exit__ methods.