purist

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If you’re a basketball purist, that’s the [expletive] you want to see.
如果你是一名篮球纯粹主义者，那就正是你会想要见识的东西。
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I probably should have said this earlier, but I'm by no means an XML purist.
也许我早应该讨论这些问题，但我并不是 XML 纯粹论者。
You're a purist about presentation, so you want to exclude the highlight domain.
在表示方面，您是一个纯粹主义者，因此您不希望包含突出显示域。

This may be a little less purist than the normal view, but I think that it is more realistic."

Mr Vladi's current catalogue features some 400 islands (and the odd peninsula: he is no purist).
ECONOMIST: Middleman Friday
They share blind of bias because there is a purist charm that hits America in the heart.
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People will have the satisfaction of having a purist position and no victories for the American people.
WHITEHOUSE: Presidential Press Conference on Tax Cuts and Unemployment Extension

someone who believes in and follows very traditional rules or ideas in a subject

A purist is a person who wants something to be totally correct or unchanged, especially something they know a lot about.
Purist attitudes are the kind of attitudes that purists have.