app.py

import gradio as gr
import os

PUBLIC_KEY = os.environ.get("PUBLIC_KEY", "NOTEXIST")
PRIVATE_KEY = os.environ.get("PRIVATE_KEY", "NOTEXIST")

def greet(name):
    return "Hello " + name + "!!" + f"public: {PUBLIC_KEY}, private: {PRIVATE_KEY}"

iface = gr.Interface(fn=greet, inputs="text", outputs="text")
iface.launch()