Modern Python Standard Library Cookbook

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The interpolation=configparser.ExtendedInterpolation() argument provided to the ConfigParser object also enables an interpolation mode that allows us to refer to values from other sections into the configuration file.

This is convenient to avoid having to repeat the same values over and over, for example, when providing multiple paths that should all start from the same root:

[paths]
root = /tmp/test01
images = ${root}/images
sounds = ${root}/sounds

Also, the syntax allows us to refer to options in other sections:

[main]
root = /tmp/test01

[paths]
images = ${main:root}/images
sounds = ${main:root}/sounds

Another convenient feature of ConfigParser is that if you want to make an option available in all sections, you can just ...