Streamlit Monkeypatching example (from https://www.youtube.com/watch?v=6f4yYwsqQD8)

streamlit_mkpatch_app.py

import streamlit as st
from streamlit.delta_generator import DeltaGenerator
from streamlit.proto.Markdown_pb2 import Markdown as MarkdownProto
from streamlit.string_util import clean_text

def markdown_but_yelling(body, unsafe_allow_html=False):
    body = f"# {body.upper()}!!!!"

    markdown_proto = MarkdownProto()
    markdown_proto.body = clean_text(body)
    markdown_proto.allow_html = unsafe_allow_html
    return DeltaGenerator()._enqueue("markdown", markdown_proto)

st.markdown = markdown_but_yelling

st.title("Hello world")
st.markdown("Coucou")

Doing random tests:

import streamlit as st
from streamlit.delta_generator import DeltaGenerator
from streamlit.proto.Markdown_pb2 import Markdown as MarkdownProto
from streamlit.string_util import clean_text

a = st.markdown("Coucou")
st.markdown("maman")

a._enqueue(
    "markdown", 
    MarkdownProto(body=clean_text("YOLO"), allow_html=False)
)

the Yolo part is correctly updated 🤔