[samatman]

In languages which don't use indentation semantically, I always end up catching a bug, sooner or later, by running code through a formatter. It's usually in a complex tree of nested if statements, some code I thought was part of one group gets moved to be in another group, making it obvious where the mistake was.

Python can't do that. It's one of a few things about the language which is "nice" when using it for simple tasks, but which makes more complex programming pointlessly error-prone.