    })
option = st.selectbox(
    'Which number do you like best?',
     df['first column'])
'You selected: ', option
```
Layout
Streamlit makes it easy to organize your widgets in a left panel sidebar with
st.sidebar. Each element that's passed to
st.sidebar is pinned to the left, allowing
users to focus on the content in your app while still having access to UI
controls.
For example, if you want to add a selectbox and a slider to a sidebar,
use st.sidebar.slider and st.sidebar.selectbox instead of st.slider and
st.selectbox:
```python
import streamlit as st
Add a selectbox to the sidebar:
add_selectbox = st.sidebar.selectbox(
    'How would you like to be contacted?',
    ('Email', 'Home phone', 'Mobile phone')
)
Add a slider to the sidebar:
add_slider = st.sidebar.slider(
    'Select a range of values',
