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[michalmonday]

I'd say that the point of the quote is that the consistency and complaince with the style guide is not always the most important, the title emphasizes that.

It's up to them to decide if they want to follow or not. In long term (if they stick with the language) they will find PEP8 is de-facto considered community standard (i.e. if they follow it's more likely to be consistent when contribute to new and existing projects, than not)

I completely agree, I think that is why your first post mentioning this matter was very useful, the 2nd post on the other side was kinda putting pressure on people (ignoring the points they made) trying to make them foolishly follow the suggested style.

Some other good reasons to ignore a particular guideline:
When applying the guideline would make the code less readable

Readability is subjective, at least 1 of the guys mentioned that it would be less readable to him if he didn't use "== True". Seeing that it would be wise to inform the guy about potential negatives of this approach (e.g. writing code that is less readable to other people), rather than telling him "do like we do".