Datatable export_csv

Hello all, I wanna to ask some details related to datatable. I would like to export a csv file with the separators as " ; ", but not " , ".

Actually, I’ve read the references below and tried 2 different ways. But it seems that it does not work.

Thx a lot for your help in advance ! !

Method1

@callback(
    Output("download-dataframe-csv", "data"),
    Input("btn-csv", "n_clicks"),
    prevent_initial_call=True,
)
def func(n_clicks):
    df.to_csv(r'a.csv', sep = ';', index = False, header=True, encoding='utf-8')
    return dcc.send_data_frame(df.to_csv, "a.csv")

Method2:

return html.Div([dash_table.DataTable(
        columns=[{"name": i, "id": i} for i in df.columns],  
        data = df.to_dict('records'),
        export_format='csv',   #xlsx
        export_headers='display',
        merge_duplicate_headers=True
    )])

Hi, @SUN Try this way.

@callback(
    Output("download-dataframe-csv", "data"),
    Input("btn-csv", "n_clicks"),
    prevent_initial_call=True,
)
def func(n_clicks):
#    df.to_csv(r'a.csv', sep = ';', index = False, header=True, encoding='utf-8')
    return dcc.send_data_frame(df.to_csv, "a.csv",sep = ';', index = False, header=True, encoding='utf-8')

It works! Thx a lot for you help!