Test dynamic widgets

SessionState.py

# https://gist.github.com/tvst/036da038ab3e999a64497f42de966a92

from streamlit.report_thread import get_report_ctx
import streamlit as st


class SessionState(object):
    def __init__(self, **kwargs):
        """A new SessionState object.

        Parameters
        ----------
        **kwargs : any
            Default values for the session state.

        Example
        -------
        >>> session_state = SessionState(user_name='', favorite_color='black')
        >>> session_state.user_name = 'Mary'
        ''
        >>> session_state.favorite_color
        'black'

        """
        for key, val in kwargs.items():
            setattr(self, key, val)


@st.cache(allow_output_mutation=True)
def get_session(id, **kwargs):
    return SessionState(**kwargs)


def get(**kwargs):
    """Gets a SessionState object for the current session.

    Creates a new object if necessary.

    Parameters
    ----------
    **kwargs : any
        Default values you want to add to the session state, if we're creating a
        new one.

    Example
    -------
    >>> session_state = get(user_name='', favorite_color='black')
    >>> session_state.user_name
    ''
    >>> session_state.user_name = 'Mary'
    >>> session_state.favorite_color
    'black'

    Since you set user_name above, next time your script runs this will be the
    result:
    >>> session_state = get(user_name='', favorite_color='black')
    >>> session_state.user_name
    'Mary'

    """
    ctx = get_report_ctx()
    id = ctx.session_id
    return get_session(id, **kwargs)
 

test.py

import SessionState
import streamlit as st
from datetime import datetime, date, timedelta


session_state = SessionState.get(
    date_range=[date(2020, 1, 1), date.today()],
    date_range_human=("Last 7 days", "Last 30 days", "All time", "Custom"),
    selected_date_range=[date(2020, 1, 1), date.today()],
    selected_date_range_human=2,
)


date_range_input = st.empty()
date_range_human_input = st.empty()

date_range_input = st.date_input(
    "Date range",
    session_state.selected_date_range,
    min_value=date(2020, 1, 1),
    max_value=date.today(),
)

date_range_human_input = st.selectbox(
    "", session_state.date_range_human, index=session_state.selected_date_range_human
)

if date_range_human_input == "Last 7 days":
    session_state.selected_date_range = [date.today() - timedelta(days=7), date.today()]
elif date_range_human_input == "Last 30 days":
    session_state.selected_date_range = [
        date.today() - timedelta(days=30),
        date.today(),
    ]
elif date_range_human_input == "All time":
    session_state.selected_date_range = [date(2020, 1, 1), date.today()]
else:
    session_state

delta = date_range_input[1] - date_range_input[0]
st.write(f"Number of days: {delta.days}")

st.markdown("---")

st.title("Debug")

"All options"
st.write(f"`{session_state.date_range[0]} - {session_state.date_range[1]}`")
st.write(session_state.date_range_human)
"Selected options "
st.write(
    f"`{session_state.selected_date_range[0]} - {session_state.selected_date_range[1]}`"
)
st.write(session_state.selected_date_range_human)