Learn

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

Instructions

To explore context managers further check out the Python Documentation.

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