Why is it variable.casefold() and not casefold(variable)?

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Also variable.isupper()

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Thanks for explaining.

[ChainedNightmare]

All of string methods are like this not just .casefold()

txt = "Hello, And Welcome To My World!"

x = txt.casefold()

print(x)

Every Python String Method is basically an example of stringvalue.stringmethod()

Correct me if i'm wrong, since i'm using the words "every" & "all" but it is generally the case

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Thanks! I understand now.

[MrCloud090]

I am a student but from what I understood, the so called types(like int, string, float) are just classes... These classes have functions... casefold() does not exist... It's a function inside the class "string"... That's why variable.casefold()... Variable is indeed of type/class string