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Python 201 - Interactively Learn Advanced Concepts in Python 3

ExitStack and Reentrant Context Managers

Explore how to use ExitStack to combine multiple context managers and manage resources efficiently. Understand why reentrant context managers are useful for enabling multiple uses without errors. This lesson helps you gain deeper control over Python's context management for cleaner, more maintainable code.

We'll cover the following...

About ExitStack

ExitStack is a context manager that will allow you to easily combine other context managers and cleanup functions programmatically.

Simple example of ExitStack

It sounds kind of confusing at first, so let’s take a look at an example from the Python documentation to help us understand this idea a bit better:

Python 3.5
from contextlib import ExitStack
filenames = []
with ExitStack() as stack:
    file_objects = [stack.enter_context(open(filename))
        for filename in filenames]

This code basically creates a series of context managers inside the ...