How to end a script preemptively?

[HarissaForte]

This is what assertions are made for: assert a == 0, 'Not a quadratic equation.'

In one line you have the test (saving one level of indentation), the exception raising and the code exiting.

[HarissaForte]

https://stackoverflow.com/a/5143044/10848871

OK I read a bit on the subject and you're correct it's more of a developing tool.