There is no method to implement format strings in the basicConfig() method of the logging module. There are the implementations of '%', '{' or '$' for printf-style, str.format() or string.Template respectively using the style keyword.

Since an f-string just evaluates to a regular string at the call site, before any logging code is invoked, there's nothing for the logging code to do. As far as it's concerned, it just gets a regular string.

It's as Eric said. So I'll close this issue as "not a bug". An additional point - by using f-strings, you may be doing unnecessary string formatting - e.g. if the event doesn't actually get handled because of logger or handler level or filter settings. It's worse if any of the parameters in the f-string are expensive to compute, as they would effectively be thrown away if the event were not to be handled.

Vinay raises a good point about performance that's well worth being aware of, especially with expensive objects (as he says). But since f-strings are much faster than other formatting (and especially .format()), there's a tradeoff. If I have something that I know is likely to be logged, sometimes I'll format it with f-strings.