Python 3 support: .compat.xrange

boltons/compat.py

@@ -9,9 +9,11 @@ IS_PY3 = sys.version_info[0] == 3
 if IS_PY2:
     from StringIO import StringIO
     unicode, str, bytes, basestring = unicode, str, str, basestring
+    xrange = xrange
 elif IS_PY3:
     from io import StringIO
     unicode, str, bytes, basestring = str, bytes, bytes, str
+    xrange = range
 else:
     raise NotImplementedError('welcome to the future, I guess. (report this)')
 

boltons/gcutils.py

@@ -34,6 +34,9 @@ from __future__ import print_function
 import gc
 import sys
 
+from .compat import xrange
+
+
 __all__ = ['get_all', 'GCToggler', 'toggle_gc', 'toggle_gc_postcollect']
 
 

boltons/listutils.py

@@ -15,11 +15,9 @@ import operator
 from math import log as math_log
 from itertools import chain, islice
 
-try:
-    from compat import make_sentinel
-    _MISSING = make_sentinel(var_name='_MISSING')
-except ImportError:
-    _MISSING = object()
+from .compat import make_sentinel, xrange
+_MISSING = make_sentinel(var_name='_MISSING')
+
 
 # TODO: expose splaylist?
 __all__ = ['BList', 'BarrelList']