要在Bokeh中構建一個實時股票市場儀表板,您可以按照以下步驟進行操作:
1、導入必要的庫和模塊:
```python
from bokeh.io import curdoc
from bokeh.layouts import column
from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.models import DatetimeTickFormatter
from bokeh.models.widgets import Div
from bokeh.models import HoverTool
from bokeh.models import Range1d
from bokeh.models import LinearAxis
import pandas as pd
import random
import time
```
2、創建一個實時數據源:
```python
source = ColumnDataSource(data=dict(
time=[], price=[]
))
```
3、創建一個繪圖函數來繪制股票價格走勢圖:
```python
def create_figure():
p = figure(plot_width=800, plot_height=400, title="Real-time Stock Market Dashboard",
x_axis_label='Time', y_axis_label='Price', x_axis_type='datetime')
p.line(x='time', y='price', source=source, line_width=2, line_color="blue")
p.xaxis.formatter=DatetimeTickFormatter(
hours=["%H:%M"],
days=["%m/%d"],
months=["%m/%Y"],
years=["%Y"],
)
p.extra_y_ranges = {"volume": Range1d(start=0, end=max(volume))}
p.add_layout(LinearAxis(y_range_name="volume", axis_label="Volume"), 'left')
p.add_tools(HoverTool(
tooltips=[
("Time", "@time{%F %T}"),
("Price", "@price{$0.2f}")
],
formatters={
'@time': 'datetime',
}
))
return p
```
4、創建一個更新數據函數來更新數據源中的數據:
```python
def update_data():
new_data = dict(
time=[pd.Timestamp.now()],
price=[random.uniform(50, 150)]
)
source.stream(new_data, rollover=100)
```
5、創建一個回調函數來定時更新數據:
```python
def update():
update_data()
# 每隔1秒更新一次數據
curdoc().add_periodic_callback(update, 1000)
```
6、將繪圖函數和數據源添加到文檔中:
```python
plot = create_figure()
curdoc().add_root(column(plot))
```
7、運行應用程序:
在終端中運行以下命令來啟動Bokeh服務器:
```
bokeh serve --show your_script.py
```
替換`your_script.py`為包含以上代碼的Python腳本文件名。您將在瀏覽器中看到一個實時股票市場儀表板,顯示股票價格的實時走勢圖。