Use binary mode for all gzip files we open.
diff --git a/Lib/test/test_gzip.py b/Lib/test/test_gzip.py
index ae7ec17..3ea2ba9 100644
--- a/Lib/test/test_gzip.py
+++ b/Lib/test/test_gzip.py
@@ -16,15 +16,15 @@
/* See http://www.winimage.com/zLibDll for Windows */
"""
-f = gzip.GzipFile(filename, 'w') ; f.write(data1) ; f.close()
+f = gzip.GzipFile(filename, 'wb') ; f.write(data1) ; f.close()
-f = gzip.GzipFile(filename, 'r') ; d = f.read() ; f.close()
+f = gzip.GzipFile(filename, 'rb') ; d = f.read() ; f.close()
assert d == data1
# Append to the previous file
-f = gzip.GzipFile(filename, 'a') ; f.write(data2) ; f.close()
+f = gzip.GzipFile(filename, 'ab') ; f.write(data2) ; f.close()
-f = gzip.GzipFile(filename, 'r') ; d = f.read() ; f.close()
+f = gzip.GzipFile(filename, 'rb') ; d = f.read() ; f.close()
assert d == data1+data2
os.unlink( filename )