# Copyright (C) 2019 EfficiOS Inc.
#
-from functools import partial, partialmethod
+import copy
+import math
import operator
import unittest
-import math
-import copy
import itertools
import collections
-import bt2
-from utils import get_default_trace_class, create_const_field
+from functools import partial, partialmethod
+import bt2
+from utils import create_const_field, get_default_trace_class
_COMP_BINOPS = (operator.eq, operator.ne)