Update app.py

app.py

@@ -1,8 +1,9 @@
 import gradio as gr
 
 def fah (cel):
+    cel=float(cel)
     fah=cel*9/5+23
-    return "fahrenheit: " + fah + "f"
+    return "fahrenheit: " + str(fah) + "f"
 
 demo = gr.Interface(fn=fah, inputs="text", outputs="text")
-demo.launch()
+demo.launch()