Congratulations! We have reached the end of the context managers lesson. Making it this far means that we have explored many of the core concepts behind context managers. Let’s recap:

Context Managers:

• Context managers are a form of resource management in python invoked by the with statement.
• They ensure that resources are closed/released after usage regardless of whether or not an error occurs.
• They can be created from scratch using either the class-based method or the contextlib decorator-based method.
• Behind every context manager, there’s an __enter__ and __exit__ method taking place.
• Context managers can be nested together to work with resources simultaneously.

Class-Based Context Managers

• They can be created from scratch with the manual implementation of the __enter__ and __exit__ method.
• The __exit__ method takes three arguments: An exception type, exception value, and a traceback. The method can then handle exceptions.

Decorator Based Context Managers

• They can be created from scratch using the contextlib contextmanager decorator on a generator function
• In the contextlib method, the except block handles exception’s code block