Boilerplate comment warning for questions and answers that make inappropriate use of eval and/or exec in Python:

[**Do not ever use `eval` (or `exec`) on data that could possibly come from outside the program in any form. It is a critical security risk. You allow the author of the data to run arbitrary code on your computer. It cannot easily be sandboxed, and proper sandboxing is harder than using a proper tool for the job.**](https://stackoverflow.com/questions/1832940/why-is-using-eval-a-bad-practice)

SEDE query to help Mjollnir-wielders re-link duplicates directly to a canonical:

https://data.stackexchange.com/stackoverflow/query/1704180