diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..30424ee
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1,5 @@
+from .loader import TextLoader
+
+
+def text_loader(*args, **kwargs):
+    return TextLoader(*args, **kwargs)
diff --git a/loader.py b/loader.py
new file mode 100644
index 0000000..4805b0e
--- /dev/null
+++ b/loader.py
@@ -0,0 +1,16 @@
+from towhee.operator import PyOperator
+
+
+class TextLoader(PyOperator):
+    """
+    DefaultOperator for _input and _output nodes.
+    """
+
+    def __init__(self):
+        #pylint: disable=useless-super-delegation
+        super().__init__()
+
+    def __call__(self, *args):
+        if len(args) == 1:
+            return args[0]
+        return args