Session state for multiple nested buttons

Using Streamlit
1

Please how can I handle this, this is my first time using streamlit

Expected Behavior
I want this code to work this way, once the user uploads the csv file, it runs the if data is not None if statement, then shows the “Predict Dataset” Button", which when pressed computes the code in that if statement that shows a download button for the data download.
Actual Behavior
It restarts the session anytime I upload a file
Debug info
Python 3.9.12
streamlit 1.13.0
OS:Windows 10
Chrome,
VS Code editor

My Question now is how to use session state to fix this issue.

if st.button("Upload CSV with DateTime Column"):
        

        st.write("IMPORT DATA")
        st.write(
            "Import the time series CSV file. It should have one column labelled as 'DateTime'")
        data = st.file_uploader('Upload here', type='csv')
        st.session_state.counter = 0
        if data is not None:
            dataset = pd.read_csv(data)
            dataset['DateTime'] = pd.to_datetime(dataset['DateTime'])
            dataset = dataset.sort_values('DateTime')

            junction = st.number_input(
                'Which Junction:', min_value=1, max_value=4, value=1, step=1, format='%d')

            results = predict_traffic(junction, dataset['DateTime'])
            st.write('Upload Sucessful')
            st.session_state.counter += 1
            if st.button("Predict Dataset"):
                result = results
                result = pd.concat([dataset, result], axis=1)
                st.success('Successful!!!')
                st.write('Predicting for Junction', 1)
                st.write(result)

                def convert_df(df):
                    # IMPORTANT: Cache the conversion to prevent computation on every rerun
                    return df.to_csv().encode('utf-8')

                csv = convert_df(result)

                st.download_button(
                    label="Download Traffic Predictions as CSV",
                    data=csv,
                    file_name='Traffic Predictions.csv',
                    mime='text/csv',
                )
                st.session_state.counter += 1

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Debug info

  • Streamlit version: (get it with $ streamlit version)
  • Python version: (get it with $ python --version)
  • Using Conda? PipEnv? PyEnv? Pex?
  • OS version:
  • Browser version:

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2

Hi there,

Thanks for sharing your question with the community! Check out our guidelines on how to post an effective question here – in particular, please share your question or a description of the issue you’re trying to solve, rather than just the code.

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Caroline :balloon:

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