Refactor some utility code to a compat module.

Author: ionelmc

src/lazy_object_proxy/compat.py

@@ -0,0 +1,9 @@
+import sys
+
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    return meta("NewBase", bases, {})

src/lazy_object_proxy/simple.py

@@ -1,14 +1,8 @@
-from functools import partial
-import sys
 import operator
 
-PY2 = sys.version_info[0] == 2
-PY3 = sys.version_info[0] == 3
-
-
-def with_metaclass(meta, *bases):
-    """Create a base class with a metaclass."""
-    return meta("NewBase", bases, {})
+from .compat import PY2
+from .compat import PY3
+from .compat import with_metaclass
 
 
 class cached_property(object):

src/lazy_object_proxy/slots.py

@@ -1,13 +1,8 @@
-import sys
 import operator
 
-PY2 = sys.version_info[0] == 2
-PY3 = sys.version_info[0] == 3
-
-
-def with_metaclass(meta, *bases):
-    """Create a base class with a metaclass."""
-    return meta("NewBase", bases, {})
+from .compat import PY2
+from .compat import PY3
+from .compat import with_metaclass
 
 
 class _ProxyMethods(object):