How to download a file in Streamlit?

Starting with v0.88, st.download_button is natively built into Streamlit. Check out the release notes, API, and a sample app.

import streamlit as st

# Text files
text_contents = '''
Foo, Bar
123, 456
789, 000
# Different ways to use the API
st.download_button('Download CSV', text_contents, 'text/csv')
st.download_button('Download CSV', text_contents)  # Defaults to 'text/plain'
with open('myfile.csv') as f:
   st.download_button('Download CSV', f)  # Defaults to 'text/plain'
# ---
# Binary files
binary_contents = b'whatever'
# Different ways to use the API
st.download_button('Download file', binary_contents)  # Defaults to 'application/octet-stream'
with open('', 'rb') as f:
   st.download_button('Download Zip', f, file_name='')  # Defaults to 'application/octet-stream'
# You can also grab the return value of the button,
# just like with any other button.
if st.download_button(...):
   st.write('Thanks for downloading!')

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