29 lines
763 B
Python
29 lines
763 B
Python
|
"""
|
||
|
|
Bump Chart
|
||
|
|
----------
|
||
|
|
This example shows a bump chart. The data is first grouped into six-month
|
||
|
|
intervals using pandas. The ranks are computed by Altair using a
|
||
|
|
window transform.
|
||
|
|
"""
|
||
|
|
# category: line charts
|
||
|
|
|
||
|
|
import altair as alt
|
||
|
|
from vega_datasets import data
|
||
|
|
import pandas as pd
|
||
|
|
|
||
|
|
stocks = data.stocks()
|
||
|
|
source = stocks.groupby([pd.Grouper(key="date", freq="6M"),"symbol"]).mean().reset_index()
|
||
|
|
|
||
|
|
alt.Chart(source).mark_line(point = True).encode(
|
||
|
|
x = alt.X("date:O", timeUnit="yearmonth", title="date"),
|
||
|
|
y="rank:O",
|
||
|
|
color=alt.Color("symbol:N")
|
||
|
|
).transform_window(
|
||
|
|
rank="rank()",
|
||
|
|
sort=[alt.SortField("price", order="descending")],
|
||
|
|
groupby=["date"]
|
||
|
|
).properties(
|
||
|
|
title="Bump Chart for Stock Prices",
|
||
|
|
width=600,
|
||
|
|
height=150,
|
||
|
|
)
|