Build a Stop Button to exit a while loop within a Dash App

Dash Python
21

This morning, I found the answer which was pretty straightforward. I simply have to include and dump it. In every callback I can see (and print) the queue except in the while loop, where I can only see the values before entering the loop (so they don’t get updated while in the while loop)

@app.callback(
    [Output('test_graph', 'figure'),
     Output('testData', 'data')],
    Input('graph-update', 'n_intervals'),
    State('myData', 'data'),
    State('testData', 'data')
)
def tester(n, xxx, test):
    q = json.loads(xxx)
    test = json.loads(test)

    X.append(X[-1] + 1)
    Y.append(float(q[-1]))
    test.append(10)

    data = plotly.graph_objs.Scatter(
        x=list(X),
        y=list(Y),
        name='Scatter',
        mode='lines+markers'
    )

    return {'data': [data], 'layout': go.Layout(xaxis=dict(range=[min(X), max(X)]),
                                                yaxis=dict(range=[float(min(Y)), float(max(Y))]), )},  json.dumps(test, cls=DequeEncoder)

@jinnyzor , is there a way to also see updates within this while loop?

And additionally, a more theoretical question. Using the current class and json.dump we are no longer working with deque’s, right? So won’t memory issues become a problem if the lists become too long? Something that with a deque is easily solved by setting a maxlen.