Streamlit widgets doesn't display in Jupyter Notebook

Question

I'm trying to create streamlit widgets in Jupyter Notebook but when executing the following code nothing happens.
import numpy as np
import streamlit as st

age = st.selectbox("Choose your age: ", np.arange(18, 66, 1))

According to the following article a SelectBox like this should be created.

But in my code I only get to know that print(age) is 18. What am I doing wrong?

Donald S · Answer

You don't run the code from a notebook. You create a python script with your code and then use this command from a shell: streamlit run yourfile.py
the output will show up in the shell

Reason for this is that streamlit runs on the main thread so it would block the jupyter kernal, you won't be able to use the notebook while the streamlit app is running. However, if you really want to stay inside Jupyter to run the app, you can run the command in a cell, like this !streamlit run yourfile.py

Streamlit widgets doesn't display in Jupyter Notebook

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