🎵 Do you want to build a web app? 🎵

Module 1

Let’s Do Digital Team

What to build?

eGFR = estimated glomerular filtration rate

Streamlit

• We will be using a python web app framework called Streamlit.
• Frameworks are a higher level of organisation of code above libraries.

Module import

Direct import

libraries_1.py

import streamlit

or as an alias

libraries_2.py

import streamlit as st

Who is running what?

• A common practice is to use:

main.py

if __name__ == "__main__":
    main()

• Checks if the current file is being run as an imported library or directly.

Streamlit methods

streamlit methods.py

import streamlit as st

# A title for the page
st.title("My first web app")

# Writes text to the browser
st.write("Text to write to browser")

# Creates a text input field
# `step` is the increment for + - buttons
st.number_input("Label of input box", step=1) 

# Creates a select box
st.selectbox("Label for selectbox", ["first choice","second choice"])

Streamlit methods

magicEnabled = false

• We have turned off the feature in Streamlit that shows all of your code in the browser using:

.streamlit/config.toml

[runner]
magicEnabled = false

(See the .streamlit/config.toml file if interested)

Stopping a running program

CTRL - C

or

CMD - C

• If a major error happens, streamlit will not refresh and you will need to stop your program.
• You will also need to stop the program between exercises.

Warning!

• You are building an educational program. This is NOT to be used with real patients!

Time to install a framework

• You now need to install the Streamlit framework. Don’t worry, it is very easy:

$ cd ../lesson_2
$ pip install streamlit

• There will be many lines of output in the terminal. Just wait for this to finish (30-60 seconds).
• And now run this command:

$ streamlit run exercise_1.py

Now off you go!

• Lesson 3 is for those that finish lesson 2 early (but it is not a race).

Session close slides