Update checkstrformat.py

Author: BobTheBuidler

mypy/checkstrformat.py

@@ -1007,7 +1007,7 @@ def check_expr(expr: Expression) -> None:
                 ):
                     self.msg.requires_int_or_single_byte(context)
                 else:
-                    if isinstance(folded := constant_fold_expr(expr, "unused"), str):
+                    if isinstance(folded := constant_fold_expr(expr, "<unused>"), str):
                         if len(folded) != 1:
                             self.msg.requires_int_or_char(context)
                     elif isinstance(expr, BytesExpr):