Issue #13781: Fix GzipFile to work with os.fdopen()'d file objects.
diff --git a/Lib/gzip.py b/Lib/gzip.py
index ba2149e..4462187 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -156,8 +156,10 @@
if fileobj is None:
fileobj = self.myfileobj = builtins.open(filename, mode or 'rb')
if filename is None:
- if hasattr(fileobj, 'name'): filename = fileobj.name
- else: filename = ''
+ if hasattr(fileobj, 'name') and isinstance(fileobj.name, str):
+ filename = fileobj.name
+ else:
+ filename = ''
if mode is None:
if hasattr(fileobj, 'mode'): mode = fileobj.mode
else: mode = 'rb'
diff --git a/Lib/test/test_gzip.py b/Lib/test/test_gzip.py
index 2b0ac36..5ae7467 100644
--- a/Lib/test/test_gzip.py
+++ b/Lib/test/test_gzip.py
@@ -323,6 +323,14 @@
self.assertEqual(f.read(100), b'')
self.assertEqual(nread, len(uncompressed))
+ def test_fileobj_from_fdopen(self):
+ # Issue #13781: Opening a GzipFile for writing fails when using a
+ # fileobj created with os.fdopen().
+ fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT)
+ with os.fdopen(fd, "wb") as f:
+ with gzip.GzipFile(fileobj=f, mode="w") as g:
+ pass
+
# Testing compress/decompress shortcut functions
def test_compress(self):