app.py

import streamlit as st
from bokeh.models.widgets import Button
from bokeh.models import CustomJS
from streamlit_bokeh_events import streamlit_bokeh_events
import pandas as pd

df = pd.DataFrame({"x": [1, 2, 3, 4], "y": ["a", "b", "c", "d"]})

st.dataframe(df)

copy_button = Button(label="Copy DF")
copy_button.js_on_event("button_click", CustomJS(args=dict(df=df.to_csv(sep='\t')), code="""
    navigator.clipboard.writeText(df);
    """))

no_event = streamlit_bokeh_events(
    copy_button,
    events="GET_TEXT",
    key="get_text",
    refresh_on_update=True,
    override_height=75,
    debounce_time=0)