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-rw-r--r--Lib/zipfile.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 915698f..816f858 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -1918,6 +1918,8 @@ class ZipFile:
centDirSize, centDirOffset, len(self._comment))
self.fp.write(endrec)
self.fp.write(self._comment)
+ if self.mode == "a":
+ self.fp.truncate()
self.fp.flush()
def _fpclose(self, fp):