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-rw-r--r--Doc/includes/email-simple.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/includes/email-simple.py b/Doc/includes/email-simple.py
index f69ef40ff0..07dc30fd06 100644
--- a/Doc/includes/email-simple.py
+++ b/Doc/includes/email-simple.py
@@ -12,7 +12,7 @@ with open(textfile) as fp:
# me == the sender's email address
# you == the recipient's email address
-msg['Subject'] = 'The contents of %s' % textfile
+msg['Subject'] = f'The contents of {textfile}'
msg['From'] = me
msg['To'] = you