What are Python context managers?

Python's context managers are objects that manage resources, ensuring their proper opening and closing. They are used with the with statement, which guarantees that necessary resource release actions (such as closing a file or releasing locks) are performed even if exceptions occur.

Example of using a context manager to work with a file:

with open('file.txt', 'r') as f:
    data = f.read()
# the file is automatically closed after exiting the with block

You can create your own context managers by implementing the __enter__ and __exit__ methods in a class.