diff --git a/Lib/string.py b/Lib/string.py
index 489777b10c25df..261789cc10a44c 100644
--- a/Lib/string.py
+++ b/Lib/string.py
@@ -45,7 +45,7 @@ def capwords(s, sep=None):
     sep is used to split and join the words.
 
     """
-    return (sep or ' ').join(x.capitalize() for x in s.split(sep))
+    return (sep or ' ').join(map(str.capitalize, s.split(sep)))
 
 
 ####################################################################
diff --git a/Misc/NEWS.d/next/Library/2021-09-16-19-02-14.bpo-45225.xmKV4i.rst b/Misc/NEWS.d/next/Library/2021-09-16-19-02-14.bpo-45225.xmKV4i.rst
new file mode 100644
index 00000000000000..734fdd9b007d6b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-09-16-19-02-14.bpo-45225.xmKV4i.rst
@@ -0,0 +1 @@
+use map function instead of genexpr in capwords.
\ No newline at end of file