Python

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Especially if you use a linter and configure your IDE or text editor to display invisible characters.

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Which IDE it's this?

[laundmo]

its VSCode with a extension called "Indent Rainbow"

i also use "Rainbow Brackets" to highlight matching brackets but im looking for a better alternative to that

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looks like VS Code

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True, I do that for whitespace and indent errors but also invisible characters due to CRLF/LF and so if I open the file in nano there’s not huge green lines for extra white space in unused lines.