code: def render(self, obj=None, condition=None, atomic=False, update=False, filter=None, projection=None, key=None):
          
          if (atomic or update) and not obj:
              raise InvalidCondition("An object is required to render atomic conditions or updates without an object.")
  
          if filter:
              self.render_filter_expression(filter)
  
          if projection:
              self.render_projection_expression(projection)
  
          if key:
              self.render_key_expression(key)
  
          # Condition requires a bit of work, because either one can be empty/false
          condition = (condition or Condition()) & (get_snapshot(obj) if atomic else Condition())
          if condition:
              self.render_condition_expression(condition)
  
          if update:
              self.render_update_expression(obj)
docs: Main entry point for rendering multiple expressions.  All parameters are optional, except obj when
          atomic or update are True.
  
          :param obj: *(Optional)* An object to render an atomic condition or update expression for.  Required if
              update or atomic are true.  Default is False.
          :param condition: *(Optional)* Rendered as a "ConditionExpression" for a conditional operation.
              If atomic is True, the two are rendered in an AND condition.  Default is None.
          :type condition: :class:`~bloop.conditions.BaseCondition`
          :param bool atomic: *(Optional)*  True if an atomic condition should be created for ``obj`` and rendered as
              a "ConditionExpression".  Default is False.
          :param bool update: *(Optional)*  True if an "UpdateExpression" should be rendered for ``obj``.
              Default is False.
          :param filter: *(Optional)* A filter condition for a query or scan, rendered as a "FilterExpression".
              Default is None.
          :type filter: :class:`~bloop.conditions.BaseCondition`
          :param projection: *(Optional)* A set of Columns to include in a query or scan, redered as a
              "ProjectionExpression".  Default is None.
          :type projection: set :class:`~bloop.models.Column`
          :param key: *(Optional)* A key condition for queries, rendered as a "KeyConditionExpression".  Default is None.
          :type key: :class:`~bloop.conditions.BaseCondition`