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-rw-r--r--Lib/fileinput.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/fileinput.py b/Lib/fileinput.py
index 794d575..c18995b 100644
--- a/Lib/fileinput.py
+++ b/Lib/fileinput.py
@@ -235,7 +235,7 @@ class FileInput:
else:
if self._inplace:
self._backupfilename = (
- self._filename + (self._backup or ".bak"))
+ self._filename + (self._backup or os.extsep+"bak"))
try: os.unlink(self._backupfilename)
except os.error: pass
# The next few lines may raise IOError