[Python] Error in accessing widget value using Shiny in Python

I have recently been called upon to make some changes to an application built using Shiny for Python. I started with what I thought would be a very simple change, but am already running into issues.

Previously there was hard-coded a limit:

MAX_LOCATIONS_PER = 2 # Change this as needed


This now needs to be adjustable by the user, so I added a slider to the UI.

def sidebar_shelf():
return ui.sidebar(
shinyswatch.theme_picker_ui(),
ui.card(
ui.card_header(
"Max Locations",
style='color:#f8f9f9; background:#34495e !important;',
align='center'),
ui.input_slider("Max_Loc", "Select a value", min=1, max=25, value=2),
fill=True),...


And then in the server

def server(input, output, session):
shinyswatch.theme_picker_server()
store_assign_data = reactive.value(pd.DataFrame())
store_assignments = reactive.value()

@reactive.Effect
def _():
MAX_LOCATIONS_PER = input.Max_Loc()


But later when I attempt to use the MAX_LOCATIONS_PER variable

if assigned_count[idx] < MAX_LOCATIONS_PER:


The app throws

NameError: name 'MAX_LOCATIONS_PER' is not defined


Am I missing something?

Continue reading...