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by orthoxerox 423 days ago
It's also for logging:

    log.debug(f"The value of counter was {counter}, the nonce was {nonce}")
builds a new string every time the interpreter hits this line. Whereas

    log.debug(t"The value of counter was {counter}, the nonce was {nonce}")
passes a Template to the debug() function that bails out if debug mode is not on and doesn't build a string.