[Python] Does comparing the substring of two strings create new strings in Python? [duplicate]

If I do string_a[i:i + k] == string_b[j:j + k], is this inefficient because slicing creates a new string because strings are immutable? Or does Python optimize this?

Is it possible that using a for loop and comparing character by character could be more efficient?

I'm not sure that stackoverflow.com/questions/49950747/… is a duplicate because the answers there do not mention slicing a string using [] and then comparing. I already looked at that question before, but still wasn't sure about the answer.

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