散景 "server.start" 没有显示任何内容

Question

我的代码旨在跟踪世界各地的航班，但每当我尝试运行我的程序时，页面上什么也没有显示。我观察到启动服务器后，程序停止了。所以，我使用命令提示符并输入 bokeh serve flight.py。这次它开始了，并保持运行ning，但端口与声明的不同，但它仍然没有显示任何内容。有帮助吗？

我的代码（flight.py）：

import requests
import json
import pandas as pd
from bokeh.plotting import figure
from bokeh.models import HoverTool,LabelSet,ColumnDataSource
from bokeh.tile_providers import get_provider, STAMEN_TERRAIN
import numpy as np
from bokeh.server.server import Server
from bokeh.application import Application
from bokeh.application.handlers.function import FunctionHandler

def wgs84_to_web_mercator(df, lon="long", lat="lat"):
    k = 6378137
    df["x"] = df[lon] * (k * np.pi/180.0)
    df["y"] = np.log(np.tan((90 + df[lat]) * np.pi/360.0)) * k
    return df

def wgs84_web_mercator_point(lon,lat):
    k = 6378137
    x= lon * (k * np.pi/180.0)
    y= np.log(np.tan((90 + lat) * np.pi/360.0)) * k
    return x,y

lon_min,lat_min=-125.974,30.038
lon_max,lat_max=-68.748,52.214

xy_min=wgs84_web_mercator_point(lon_min,lat_min)
xy_max=wgs84_web_mercator_point(lon_max,lat_max)

x_range,y_range=([xy_min[0],xy_max[0]], [xy_min[1],xy_max[1]])

user_name='my username (not shown for obvious reasons)'
password='my password (also not shown for obvious reasons)'
url_data='https://'+user_name+':'+password+'@opensky-network.org/api/states/all?'+'lamin='+str(lat_min)+'&lomin='+str(lon_min)+'&lamax='+str(lat_max)+'&lomax='+str(lon_max)


def flight_tracking(doc):
    flight_source = ColumnDataSource({
        'icao24':[],'callsign':[],'origin_country':[],
        'time_position':[],'last_contact':[],'long':[],'lat':[],
        'baro_altitude':[],'on_ground':[],'velocity':[],'true_track':[],
        'vertical_rate':[],'sensors':[],'geo_altitude':[],'squawk':[],'spi':[],'position_source':[],'x':[],'y':[],
        'rot_angle':[],'url':[]
    })
    
    def update():
        response=requests.get(url_data).json()
        
        col_name=['icao24','callsign','origin_country','time_position','last_contact','long','lat','baro_altitude','on_ground','velocity',       
'true_track','vertical_rate','sensors','geo_altitude','squawk','spi','position_source']
        flight_data=response['states']
        flight_df=pd.DataFrame(flight_data,columns=col_name)
        wgs84_to_web_mercator(flight_df)
        flight_df=flight_df.fillna('No Data')
        flight_df['rot_angle']=flight_df['true_track']*-1
        icon_url='https://www.logolynx.com/images/logolynx/4c/4c507d3961382eefd8a48f5c387a0ee3.png' #icon url
        flight_df['url']=icon_url
        
        n_roll=len(flight_df.index)
        flight_source.stream(flight_df.to_dict(orient='list'),n_roll)
        
    doc.add_periodic_callback(update, 5000)
    p=figure(x_range=x_range,y_range=y_range,x_axis_type='mercator',y_axis_type='mercator',sizing_mode='scale_width',plot_height=300)
    tile_prov=get_provider(STAMEN_TERRAIN)
    p.add_tile(tile_prov,level='image')
    p.image_url(url='url', x='x', y='y',source=flight_source,anchor='center',angle_units='deg',angle='rot_angle',h_units='screen',w_units='screen',w=40,h=40)
    p.circle('x','y',source=flight_source,fill_color='red',hover_color='yellow',size=10,fill_alpha=0.8,line_width=0)

    my_hover=HoverTool()
    my_hover.tooltips=[('Call sign','@callsign'),('Origin Country','@origin_country'),('velocity(m/s)','@velocity'),('Altitude(m)','@baro_altitude')]
    labels = LabelSet(x='x', y='y', text='callsign', level='glyph',
            x_offset=5, y_offset=5, source=flight_source, render_mode='canvas',background_fill_color='white',text_font_size="8pt")
    p.add_tools(my_hover)
    p.add_layout(labels)
    
    doc.title='REAL TIME FLIGHT TRACKING'
    doc.add_root(p)
    
apps = {'/': Application(FunctionHandler(flight_tracking))}
server = Server(apps, port=8084) #define an unused port
server.start()```

Answer 1

根据 documentation，所有调用 start 所做的就是在 IOLoop 上安装和启用 Bokeh 的机器。

Install the Bokeh Server and its background tasks on a Tornado IOLoop.

This method does not block and does not affect the state of the Tornado IOLoop You must start and stop the loop yourself, i.e. this method is typically useful when you are already explicitly managing an IOLoop yourself.

To start a Bokeh server and immediately “run forever” in a blocking manner, see run_until_shutdown().

您需要自己控制 Tornado 的 IOLoop（或致电 run_until_shutdown）。

请注意，这些选项都与打开浏览器无关window，如果这是您的期望的话。大多数时候这不是我们想要的，所以如果这是您想要的，您需要添加一个回调来执行该操作：

from bokeh.util.browser import view
io_loop.add_callback(view, "http://localhost:5006/")

散景 "server.start" 没有显示任何内容

Bokeh "server.start" not showing anything

python

bokeh