Use os.fsencode() to support surrogates
diff --git a/Demo/zlib/minigzip.py b/Demo/zlib/minigzip.py
index 52e81b9..b57de73 100755
--- a/Demo/zlib/minigzip.py
+++ b/Demo/zlib/minigzip.py
@@ -31,7 +31,7 @@
write32(output, mtime)
output.write(b'\002') # ... slowest compression alg. ...
output.write(b'\377') # ... OS (=unknown) ...
- bfilename = filename.encode(sys.getfilesystemencoding())
+ bfilename = os.fsencode(filename)
output.write(bfilename + b'\000') # ... original filename ...
crcval = zlib.crc32(b'')