python – 更新多行的散景

从Painless Streaming Plots with Bokeh开始,它显示了如何流式传输单个变量的实时数据.如何在有多个y变量的地方流多行.

import time
from bokeh.objects import GlyphRenderer
renderer = [r for r in curplot().renderers if isinstance(r,GlyphRenderer)][0]
ds = renderer.data_source
while True:
    df = pd.io.json.read_json(url+json_call)
    ds.data["x"] = x+N*i
    ds.data["y"] = df.rssi
    ds._dirty = True
    session().store_obj(ds)
    time.sleep(1.5)
    i+=1