This is reasonable, and I do it all the time. Obviously, this is not a format that you use to exchange data, so it is not a good format for anything like a save file.
But, for example, when I transfer sites to Plone, I often get information about the site (for example, a list of pages to be redirected to, or a list of how old URLs should be displayed on new ones, or lists of tags). This you usually get in Word och Excel format. In addition, the data often needs to be massaged by bits, and I end up with dictionaries for all purposes and purposes that display one URL for some other information.
Of course, I could save this as CVS and parse it in a dictionary. But instead, I usually save it as a Python file with a dictionary. Saves the code.
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