Update

app.py

@@ -1,9 +1,21 @@
 #!/usr/bin/env python
 
 import gradio as gr
+import pandas as pd
+
+
+def fn(df: pd.DataFrame) -> str:
+    return "a"
+
+
+df_orig = pd.DataFrame(data={"a": [1, 2, 3]})
 
 with gr.Blocks() as demo:
-    pass
+    df = gr.Dataframe(value=df_orig, type="pandas", interactive=False)
+    btn = gr.Button()
+    text = gr.Textbox()
+
+    btn.click(fn=fn, inputs=df, outputs=text)
 
 if __name__ == "__main__":
     demo.queue().launch()