Added python 2.6 backport

sqlalchemy_utils/types/weekdays.py

@@ -1,5 +1,77 @@
 # -*- coding: utf-8 -*-
-from functools import total_ordering
+try:
+    from functools import total_ordering
+except ImportError:
+    """ Backport to work with Python 2.6 """
+    def total_ordering(cls):
+        """Class decorator that fills in missing ordering methods"""
+        convert = {
+            '__lt__': [
+                (
+                    '__gt__',
+                    lambda self, other: not (self < other or self == other)
+                ),
+                (
+                    '__le__',
+                    lambda self, other: self < other or self == other
+                ),
+                (
+                    '__ge__',
+                    lambda self, other: not self < other
+                )],
+            '__le__': [
+                (
+                    '__ge__',
+                    lambda self, other: not self <= other or self == other
+                ),
+                (
+                    '__lt__',
+                    lambda self, other: self <= other and not self == other
+                ),
+                (
+                    '__gt__',
+                    lambda self, other: not self <= other
+                )],
+            '__gt__': [
+                (
+                    '__lt__',
+                    lambda self, other: not (self > other or self == other)
+                ),
+                (
+                    '__ge__',
+                    lambda self, other: self > other or self == other
+                ),
+                (
+                    '__le__',
+                    lambda self, other: not self > other
+                )],
+            '__ge__': [
+                (
+                    '__le__',
+                    lambda self, other: (not self >= other) or self == other
+                ),
+                (
+                    '__gt__',
+                    lambda self, other: self >= other and not self == other
+                ),
+                (
+                    '__lt__',
+                    lambda self, other: not self >= other
+                )]
+        }
+        roots = set(dir(cls)) & set(convert)
+        if not roots:
+            raise ValueError(
+                'must define at least one ordering operation: < > <= >='
+            )
+        root = max(roots)       # prefer __lt__ to __le__ to __gt__ to __ge__
+        for opname, opfunc in convert[root]:
+            if opname not in roots:
+                opfunc.__name__ = opname
+                opfunc.__doc__ = getattr(int, opname).__doc__
+                setattr(cls, opname, opfunc)
+        return cls
+
 
 from sqlalchemy import types
 from sqlalchemy.dialects.postgresql import BIT