app.py

import gradio as gr
from pathlib import Path

running_markdown_content = """
# Something is running (hopefully!)

If all went to plan, something should be running. check the logs.
"""

startup_markdown_content = """
# Welcome! Lets get started...

Here we'd want some input from the user to start a run.
"""

with gr.Blocks() as demo:
    gr.Markdown(running_markdown_content if Path('data.csv').exists() else startup_markdown_content)

if __name__ == '__main__':
    demo.launch()