Streaming Tabulator#
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import numpy as np
import pandas as pd
import panel as pn
pn.extension('tabulator', sizing_mode="stretch_width")
This example demonstrates the powerful streaming capabilities of the Tabulator widget.
df = pd.DataFrame(np.random.randn(10, 4), columns=list('ABCD')).cumsum()
rollover = pn.widgets.IntInput(name='Rollover', value=15)
follow = pn.widgets.Checkbox(name='Follow', value=True, align='end')
tabulator = pn.widgets.Tabulator(df, height=450)
def color_negative_red(val):
"""
Takes a scalar and returns a string with
the css property `'color: red'` for negative
strings, black otherwise.
"""
color = 'red' if val < 0 else 'green'
return 'color: %s' % color
tabulator.style.applymap(color_negative_red)
def stream():
data = df.iloc[-1] + np.random.randn(4)
tabulator.stream(data, rollover=rollover.value, follow=follow.value)
cb = pn.state.add_periodic_callback(stream, 200)
component = pn.Column(
pn.Row(cb.param.period, rollover, follow, width=400),
tabulator,
)
component
App#
Lets wrap it into nice template that can be served via panel serve streaming_tabulator.ipynb
pn.template.FastListTemplate(
site="Panel",
title="Streaming Tabulator",
main=[
"This example demonstrates the **powerful streaming capabilities** of Panel and the `Tabulator` widget.",
component,
]
).servable();
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Download this notebook from GitHub (right-click to download).