remove some prints, unused libraries, __setitem__ method

beets/autotag/hooks.py

@@ -60,10 +60,6 @@ class Map(dict):
     def __setattr__(self, key, value):
         self.__setitem__(key, value)
 
-    def __setitem__(self, key, value):
-        super(Map, self).__setitem__(key, value)
-        self.__dict__.update({key: value})
-
     def __delattr__(self, item):
         self.__delitem__(item)
 

test/test_autotag.py

@@ -18,7 +18,6 @@
 from __future__ import division, absolute_import, print_function
 
 import re
-import copy
 import unittest
 
 from test import _common

test/test_ui.py

@@ -22,7 +22,6 @@ import shutil
 import re
 import subprocess
 import platform
-from copy import deepcopy
 import six
 import unittest