Context Manager Protocol
Explore the context manager protocol in Python, understanding how the with statement simplifies resource management using __enter__ and __exit__ methods. Learn to create custom context managers and use the @contextmanager decorator to write efficient, clean code that handles resource initialization and cleanup automatically.
We'll cover the following...
Introduction
Brush up, when we talk about Python being humble with the for loop. Behind the curtains, we have iterators working. Likewise, context managers exist to control a with statement. Whereas, the with statement was introduced to simplify the try/finally pattern.
❗️ Note: The
try/finallypattern won’t be discussed here. We expect that you know how it works. In case you are new to it, please refer to the official documentation.
Before jumping directly to context managers, let’s have a quick overview of the with statement.
Overview of with statement
The syntax of the with statement looks as:
with expression [as variable]:
with-block
When this expression is evaluated, it gives an object that supports the context management protocol. ...