Modernize code for easier Python 3 port

- Replace print statement with function call
- Replace except ..., ...: syntax with except ... as ...:
- Simplify obsolete try ... except ... code block
- Replace some unicode calls with u-prefixed strings
- Do not use `len(SEQUENCE)` to determine if a sequence is empty
- Replace dictionary creation
- Drop support for GObject static bindings

whipper/command/accurip.py

@@ -59,9 +59,7 @@ retrieves and display accuraterip data from the given URL
                 assert len(r.checksums) == r.num_tracks
                 assert len(r.confidences) == r.num_tracks
 
-                entry = {}
-                entry["confidence"] = r.confidences[track]
-                entry["response"] = i + 1
+                entry = {"confidence": r.confidences[track], "response": i + 1}
                 checksum = r.checksums[track]
                 if checksum in checksums:
                     checksums[checksum].append(entry)