How to store a variable from a session to a file/internally that can be used next time in another session?

Using Streamlit
,
1

I do realize that the session states can pass on the variables but those exist only till the session(browser) is open. Is there a way to store a variable like a counter value from the current session and then load the same value again in a new session(close and rerun the app).

2

Hi @Ishan_Mistry,

That’s a great use case for a database! Unfortunately, there’s not a built-in database in streamlit yet, but hopefully that will be built in in a future version. In the meantime, there are a number of great options for a third-party database, and we have tutorials about connecting your streamlit app to many of them Connect to data sources - Streamlit Docs.

3

Im not sure its exactly what you’re looking for, but I like to allow the user an option to save a large amount of settings as json, and then load it…
the problem is that it doesnt really work with upload widgets and its a bit problematic with my apps…
but anyways, here is my implementaion:

def get_session_state_dict():
    session_state_dict = {
        k: v
        for k, v in st.session_state.items()
        if "button" not in k and "file_uploader" not in k and "FormSubmitter" not in k
    }
    st.download_button(
        label="Save Current Settings as a File",
        data=json.dumps(session_state_dict , default=str),
        file_name="Settings.json",
    )

    upload_settings_widget = st.file_uploader(
        label="Upload Previously Saved Settings File",
        type=["json"],
        accept_multiple_files=False,
    )

    if upload_settings_widget:
        with upload_settings_widget.getvalue() as f:
            uploaded_settings = json.loads(f)
            failed = []
            succeeded = []
            button_apply_uploaded_settings = st.button(
                "Apply Settings",
                on_click=apply_uploaded_settings,
                args=(uploaded_settings,),
            )


def apply_uploaded_settings(json_settings):
    failed = []
    succeeded = []
    for k, v in json_settings.items():
        try:
            st.session_state[k] = v
            succeeded.append(k)
        except:
            failed.append(k)
    st.success(
        f"Successfully uploaded {str(len(succeeded))} out of {str(len(succeeded) + len(failed))} settings"
    )
    if len(failed) > 0:
        st.error(
            f"Failed to upload the following settings: {failed}"
        )

Sorry if its a mess, I am away from my laptop

4

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