Define both __div__ and __truediv__ to work on all Python versions

wrappers/python/simtk/unit/quantity.py

@@ -383,6 +383,8 @@ class Quantity(object):
             return self * pow(other, -1.0)
             # return Quantity(self._value / other, self.unit)
 
+    __div__ = __truediv__
+
     def __rtruediv__(self, other):
         """Divide a scalar by a quantity.
         
@@ -398,6 +400,8 @@ class Quantity(object):
             return other * pow(self, -1.0)
             # return Quantity(other / self._value, pow(self.unit, -1.0))
 
+    __rdiv__ = __rtruediv__
+
     def __pow__(self, exponent):
         """Raise a Quantity to a power.
         

wrappers/python/simtk/unit/unit.py

@@ -187,6 +187,8 @@ class Unit(object):
         """
         return self * pow(other, -1)
 
+    __div__ = __truediv__
+
     # def __rtruediv__(self, other):
     # Because rtruediv returns a Quantity, look in quantity.py for definition of Unit.__rtruediv__
 

wrappers/python/simtk/unit/unit_operators.py

@@ -44,6 +44,7 @@ def _unit_class_rdiv(self, other):
         return Quantity(value, unit).reduce_unit(self)
 
 Unit.__rtruediv__ = _unit_class_rdiv
+Unit.__rdiv__ = _unit_class_rdiv
 
 
 def _unit_class_mul(self, other):