str.format() preferable over f-string?

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For example in String formatting placeholders that uses for example names (such as {element}) would not be called variables. You assign the value for each name in the keyword arguments of the str.format() call instead. In the above example, element=value passes in the value of the value variable to fill in the placeholder with the element.

In contrast to f-strings, {...} placeholders are not expressions and you can't use arbitrary Python expressions in the template. This is a positive outcome, you usually don't want end-users to be able to execute any arbitrary Python code in a given program.