Update app.py

app.py

@@ -1,10 +1,13 @@
 import gradio as gr
 
 def convert_to_fahrenheit(celsius):
-  
-    fahrenheit = celsius * 9/5 + 32
-    return f"{fahrenheit} °F"
-    
+    try:
+        celsius = float(celsius)
+        fahrenheit = celsius * 9/5 + 32
+        return f"{fahrenheit} °F"
+    except ValueError:
+        return "Please enter a valid number."
+
 demo = gr.Interface(fn=convert_to_fahrenheit, inputs="text", outputs="text")
 
 demo.launch()