Implement option to get generic inverses from Python

src/ifcopenshell-python/ifcopenshell/file.py

@@ -49,8 +49,12 @@ class file(object):
 		return entity_instance(self.wrapped_data.add(inst.wrapped_data))
 	def by_type(self, type):
 		return [entity_instance(e) for e in self.wrapped_data.by_type(type)]
-	def traverse(self, inst):
-		return [entity_instance(e) for e in self.wrapped_data.traverse(inst.wrapped_data)]
+	def traverse(self, inst, max_levels=None):
+		if max_levels is None:
+			max_levels = -1
+		return [entity_instance(e) for e in self.wrapped_data.traverse(inst.wrapped_data, max_levels)]
+	def get_inverse(self, inst):
+		return [entity_instance(e) for e in self.wrapped_data.get_inverse(inst.wrapped_data)]
 	def remove(self, inst):
 		return self.wrapped_data.remove(inst.wrapped_data)
 	def __iter__(self):

src/ifcwrap/IfcParseWrapper.i

@@ -82,6 +82,10 @@ namespace IfcUtil {
 	IfcEntityList::ptr traverse(IfcParse::IfcLateBoundEntity* e, int max_level=-1) {
 		return $self->traverse(e, max_level);
 	}
+	IfcEntityList::ptr get_inverse(IfcParse::IfcLateBoundEntity* e) {
+		return $self->getInverse(e->id(), IfcSchema::Type::UNDEFINED, -1);
+	}
+
 	void write(const std::string& fn) {
 		std::ofstream f(fn.c_str());
 		f << (*$self);