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'