shiny for python. How to apply theme classes to ui elements

[massa]

Hi there,
I am learning shiny for python. I know that using shinyswatch I can import themes from bootswatch.
However, I would like to know how to apply classes to ui elements. For example the navbar (e.g.
bg-primary vs bg-light) or for example to input_action_button (e.g. btn-primary vs btn-outline-primary).
My aim is to be able to create the same ui both in R and in Python. However, in R bslib I can use "class=" for actionbutton and bs_theme( "navbar-bg"="black") for the navbar background color. Is there anything similar in shiny for python?
Thank you so much.

[massa]

Hi there, I answer my own question. I found an answer here using class_:

Shiny for Python – ui.input_action_button

Here an example:

import matplotlib.pyplot as plt
import numpy as np

from shiny import App, Inputs, Outputs, Session, reactive, render, ui

app_ui = ui.page_fluid(
    ui.input_slider("n", "Number of observations", min=0, max=1000, value=500),
    ui.input_action_button("go", "Go!", class_="btn-success"),
    ui.output_plot("plot"),
)


def server(input: Inputs, output: Outputs, session: Session):
    @output
    @render.plot(alt="A histogram")
    # Use reactive.event() to invalidate the plot only when the button is pressed
    # (not when the slider is changed)
    @reactive.event(input.go, ignore_none=False)
    def plot():
        np.random.seed(19680801)
        x = 100 + 15 * np.random.randn(input.n())
        fig, ax = plt.subplots()
        ax.hist(x, bins=30, density=True)
        return fig


app = App(app_ui, server)