F-strings, short for formatted string literals, allow variables and expressions to be embedded directly into a string by placing them inside curly braces {}. These strings are prefixed with an f or F, ...

Python - Format Strings In Python, you can format strings to include variables or values using the format () method. This allows you to create dynamic strings with placeholders that are replaced by ...

That still doesn't make sense for an output message. How is someone supposed to use "{!r}" with bytes in a formatted string literal? We're not formatting b'abc' with {}, because the bytes are inside ...