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-rw-r--r--Doc/includes/email-unpack.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/includes/email-unpack.py b/Doc/includes/email-unpack.py
index e0a7f01f58..c8cb0be456 100644
--- a/Doc/includes/email-unpack.py
+++ b/Doc/includes/email-unpack.py
@@ -43,7 +43,7 @@ Unpack a MIME message into a directory of files.
if not ext:
# Use a generic bag-of-bits extension
ext = '.bin'
- filename = 'part-%03d%s' % (counter, ext)
+ filename = f'part-{counter:03d}{ext}'
counter += 1
with open(os.path.join(args.directory, filename), 'wb') as fp:
fp.write(part.get_payload(decode=True))