Wave for Python Stock Ticker Sample App

stock_ticker_wave.py

from h2o_wave import main, app, ui, Q, on, handle_on, data

from pandas_datareader import data as web
import pandas as pd
from datetime import datetime as dt


@app("/")
async def serve(q: Q):
    stock = q.args["my-dropdown"] or "COKE"

    df = web.DataReader(stock, "yahoo", dt(2017, 1, 1), dt.now()).reset_index()
    df["Date"] = df["Date"].apply(lambda d: pd.Timestamp(d).isoformat())

    print(df.head())

    q.page["card"] = ui.form_card(
        box="1 1 12 10",
        items=[
            ui.dropdown(
                name="my-dropdown",
                choices=[
                    ui.choice("COKE", "Coke"),
                    ui.choice("TSLA", "Tesla"),
                    ui.choice("AAPL", "Apple"),
                ],
                value=stock,
                trigger=True
            ),
            ui.visualization(
                name="my-graph",
                plot=ui.plot(marks=[
                    ui.mark(type='line', x='=Date', x_scale="time", y='=Open', color="Green"),
                    ui.mark(type='line', x='=Date', x_scale="time", y='=Close', color="Red"),
                ]),
                data=data(
                    fields=["Date", "Open", "Close"],
                    rows=df[["Date", "Open", "Close"]].values.tolist(),
                    pack=True,
                ),
            )
        ]
    )

    await q.page.save()