Download button for csv or xlsx file

🎈 Using Streamlit
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2

Hi Simon
I was struggled with the same problem before, you can have a shot with following code which works fine with me.

import pandas as pd
from io import BytesIO
from pyxlsb import open_workbook as open_xlsb
import streamlit as st

def to_excel(df):
    output = BytesIO()
    writer = pd.ExcelWriter(output, engine='xlsxwriter')
    df.to_excel(writer, index=False, sheet_name='Sheet1')
    workbook = writer.book
    worksheet = writer.sheets['Sheet1']
    format1 = workbook.add_format({'num_format': '0.00'}) 
    worksheet.set_column('A:A', None, format1)  
    writer.save()
    processed_data = output.getvalue()
    return processed_data
df_xlsx = to_excel(df)
st.download_button(label='📥 Download Current Result',
                                data=df_xlsx ,
                                file_name= 'df_test.xlsx')
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