Python 3 - Second Edition

22.2    Helper Functions for with Contexts: contextlib

The contextlib module of the standard library contains functions and decorators for handling with contexts. For example, objects can be extended to become context managers that were not actually created for this purpose. Other functions in contextlib allow you to suppress certain exceptions or redirect screen output.

To run the examples in this section, you must first import the contextlib module:

>>> import contextlib  

22.2.1    Dynamically Assembled Context Combinations: ExitStack

The with statement provides a simple and elegant syntax for executing program parts within a defined context—for example, in the context of an open file object. Moreover, you know that multiple with statements ...