Derived from the Pyflakes linter.
Fix is always available.
What it does#
Checks for f-strings that do not contain any placeholder expressions.
Why is this bad?#
f-strings are a convenient way to format strings, but they are not necessary if there are no placeholder expressions to format. In this case, a regular string should be used instead, as an f-string without placeholders can be confusing for readers, who may expect such a placeholder to be present.
An f-string without any placeholders could also indicate that the author forgot to add a placeholder expression.