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How to run subprocess in streamlit using asyncio and display output

The following example runs a command using subprocess and displays the output in a Streamlit app. It uses asyncio to run the subprocess asynchronously and st.code() to display the output.

Note that this does not provide a realtime display of the output. The subprocess is run first, and only after finishing, the output is displayed in the Streamlit app.

streamlit_subprocess_simple.py
import streamlit as st
import asyncio
import sys

async def run_subprocess():
    process = await asyncio.create_subprocess_exec(
        'ping', '-c', '10', '1.1.1.1',
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
    )

    stdout, stderr = await process.communicate()
    return stdout.decode(), stderr.decode()

async def main():
    st.write("Running subprocess...")
    stdout, stderr = await run_subprocess()
    
    st.write("Subprocess output:")
    st.code(stdout)
    
    st.write("Subprocess errors:")
    st.code(stderr)

if __name__ == '__main__':
    asyncio.run(main())
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