Python realtime plotting

Question

I acquire some data in two arrays: one for the time, and one for the value. When I reach 1000 points, I trigger a signal and plot these points (x=time, y=value).

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Answer 1

To be totally interactive, you could use Bokeh for this. Concretely you could use an update function that is called every X ms and stream the new data.

Here there is a fragment I use:

def update():
     candle_data.stream(new_data, 300)   

plot = figure(x_axis_type='datetime',x_range=(start_day, final_day), width=1500, height=900, title='Live Chart', sizing_mode='scale_both')
plot.segment(x0='time', y0='highest', x1='time', y1='lowest', color='black', source=candle_data)
plot.vbar(x='time', width = 0.5*60*60*50 ,bottom='open', top='close',fill_color='color', line_color='black', source = candle_data) 
doc.add_root(column([plot]))
doc.add_periodic_callback(update, 20000)
doc.title = "Candle Data Live Rates"