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f-string-missing-placeholders (F541)#

Derived from the Pyflakes linter.

Autofix 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.


f"Hello, world!"

Use instead:

"Hello, world!"