Merge pull request #23 from benjamij/model-bugfix

BUGFIX: Added type check to model when accepting visitors on binary expressions (fixes #23)

plyj/model.py

@@ -459,8 +459,10 @@ def __init__(self, operator, lhs, rhs):
 
     def accept(self, visitor):
         if visitor.visit_BinaryExpression(self):
-            self.lhs.accept(visitor)
-            self.rhs.accept(visitor)
+            if type(self.lhs) is not str:
+                self.lhs.accept(visitor)
+            if type(self.rhs) is not str:
+                self.rhs.accept(visitor)
 
 
 class Assignment(BinaryExpression):