From 35549a52a4ad87c4125abaca317d8472012b596a Mon Sep 17 00:00:00 2001
From: MomIsBestFriend <>
Date: Sat, 16 Nov 2019 21:06:19 +0200
Subject: [PATCH] F-string

---
 asv_bench/benchmarks/io/csv.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/asv_bench/benchmarks/io/csv.py b/asv_bench/benchmarks/io/csv.py
index adb3dd95e3574..b8e8630e663ee 100644
--- a/asv_bench/benchmarks/io/csv.py
+++ b/asv_bench/benchmarks/io/csv.py
@@ -132,7 +132,7 @@ class ReadCSVConcatDatetimeBadDateValue(StringIORewind):
     param_names = ["bad_date_value"]
 
     def setup(self, bad_date_value):
-        self.StringIO_input = StringIO(("%s,\n" % bad_date_value) * 50000)
+        self.StringIO_input = StringIO((f"{bad_date_value},\n") * 50000)
 
     def time_read_csv(self, bad_date_value):
         read_csv(