[Python] How to access code in different files inside the main app?

I have a rather large app.py file, so I'd like to take a nav panel out and store it in a separate file. I'm not sure how to access code from a different file and include it in the main app.

The app.py file:

import page

from shiny import reactive, render, req, ui
from shiny.express import input, ui

with ui.navset_hidden(id="selected_navset_tab"):
# Homepage
with ui.nav_panel("Welcome", value="page_home"):
with ui.card():
# Variable calculated
ui.input_selectize(
"filler", "Filler",
["list", "of", "items", "here"],
multiple=False
)


The other file, page.py:

from shiny import reactive, render, req, ui
from shiny.express import input, ui

with ui.nav_panel("Page I want to put in the main app", value="other_page"):
@render.express
def filler_text():
"Filler text"


How can I import the other_page nav panel to show as part of the navset_tab in the main app.py file, without actually putting it in the code?

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