In short
A string is a piece of text in quotation marks, such as "hello". A string is a sequence of characters that you cannot change in place.
Characters are numbered from , so "python"[0] is "p", and a negative number counts from the end: "python"[-1] is "n". Joining strings uses +, and repeating them uses *. Useful methods are upper, lower, strip, replace, find and split. An f-string, written f"mass = {m} kg", puts the value of a variable into the text.
This prints NEWTON 6 n.
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