diff --git a/x2paddle/op_mapper/tf_op_mapper.py b/x2paddle/op_mapper/tf_op_mapper.py
index 67443bf926b141c1e9bd20c4dc06f3f04b2bd4c4..aba5f950081bc7ada25b5dd2fdeca4e70f2da714 100644
--- a/x2paddle/op_mapper/tf_op_mapper.py
+++ b/x2paddle/op_mapper/tf_op_mapper.py
@@ -85,7 +85,7 @@ class TFOpMapper(OpMapper):
 
         not_placeholder = list()
         for name in self.graph.input_nodes:
-            if self.graph.get_node(name).layer_type != "Placeholder" 
+            if self.graph.get_node(name).layer_type != "Placeholder" \
                and self.graph.get_node(name).layer_type != "OneShotIterator":
                 not_placeholder.append(name)
         for name in not_placeholder: