How to set file download function?

🎈 Using Streamlit
1

I want to add a file download function in my Streamlit app. The file is a csv file which contains some technical templates. So users can download the template by themselves within Streamlit apps. Is there any possibility to make this happen? Thank you.

2

You can encode things as a data link, this is what I’m using (copied from someone else, so thanks to whoever that was :slight_smile: ). Takes a dataframe as an input but you can do it with just text/other file you read in. It’s not a nice static serving, but this should work well enough.

def get_table_download_link(df):
    """Generates a link allowing the data in a given panda dataframe to be downloaded
    in:  dataframe
    out: href string
    """
    csv = df.to_csv(index=False)
    b64 = base64.b64encode(
        csv.encode()
    ).decode()  # some strings <-> bytes conversions necessary here
    return f'<a href="data:file/csv;base64,{b64}" download="myfilename.csv">Download csv file</a>'

st.markdown(get_table_download_link(data), unsafe_allow_html=True)
2 Likes
3

Thank you very much. lan_Calvert! :grin:

1 Like
4

So while this is a great solution, it doesn’t seem to work when my CSV file has over a million records. :frowning:
Any idea why? Thoughts on alternatives?