使用Altair绘制市值图

以网易股票的股价为输入，尝试使用Altair绘制市值图：

#!/usr/bin/env python3
import os
import json
import requests
import altair as alt

stocks_file = 'stock.json'


def fetch_stocks():
    url = 'http://quotes.money.163.com/hs/service/diyrank.php'
    fields = [
            'NO',
            'SYMBOL',
            'NAME',
            'PRICE',
            'PERCENT',
            'UPDOWN',
            'FIVE_MINUTE',
            'OPEN',
            'YESTCLOSE',
            'HIGH',
            'LOW',
            'VOLUME',
            'TURNOVER',
            'HS',
            'LB',
            'WB',
            'ZF',
            'PE',
            'MCAP',
            'TCAP',
            'MFSUM',
            'MFRATIO.MFRATIO2',
            'MFRATIO.MFRATIO10',
            'SNAME',
            'CODE',
            'ANNOUNMT',
            'UVSNEWS'
            ]
    payload = {
            'query': 'STYPE:EQA',
            'fields': ','.join(fields),
            'count': 0
            }

    response = requests.get(url, params=payload)
    if response.status_code != requests.codes.ok:
        print(response.reason)
        return False
    else:
        return response.json()


def is_stored():
    return os.path.exists(stocks_file) and os.path.isfile(stocks_file)


def store_stocks():
    stocks = fetch_stocks()
    if not stocks:
        return

    with open(stocks_file, 'w') as f:
        json.dump(stocks, f, ensure_ascii=False, indent=2)


def read_stocks():
    if not is_stored():
        store_stocks()

    with open(stocks_file) as f:
        return json.load(f)['list']


def plot():
    stocks = alt.Data(values=sorted(read_stocks(),
                                    key=lambda k: -k['TCAP'])[:30])
    chart = alt.Chart(stocks).mark_bar().encode(
            x=alt.X('TCAP:Q'),
            y=alt.Y('NAME:N', sort=alt.SortField(field='TCAP',
                    order='descending', op='sum'),
                    scale=alt.Scale(bandSize=13.0,)),
            )
    chart.serve('0.0.0.0', 8888)


if __name__ == '__main__':
    plot()

最终生成市值Top30图片如下：

市值Top30

最终生成的是静态图，无法互动，还是不如D3.js生成的图标漂亮。