Make test_wave.py pass.
I have no illusion that this fixes all issues with this module.
diff --git a/Lib/test/test_wave.py b/Lib/test/test_wave.py
index 1a6ff5c..85f5566 100644
--- a/Lib/test/test_wave.py
+++ b/Lib/test/test_wave.py
@@ -16,7 +16,7 @@
 f.setsampwidth(sampwidth)
 f.setframerate(framerate)
 f.setnframes(nframes)
-output = '\0' * nframes * nchannels * sampwidth
+output = b'\0' * nframes * nchannels * sampwidth
 f.writeframes(output)
 f.close()