merge Expr literal

AST.py

@@ -83,7 +83,7 @@ class ASTNode():
                     # Note: this check is redundant if we're certain that every override of this method has the initial check
                     if not hasattr(c, "code"): 
                         c.codeGen()
-                    self.code += c.code     
+                    self.code += c.code
 
     def printNodePretty(self, prefix=0):
         pp = pprint.PrettyPrinter(indent=prefix)