File: trellis_histogram.py

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"""
Trellis Histogram
-----------------
This example shows how to make a basic trellis histogram.
https://vega.github.io/vega-lite/examples/trellis_bar_histogram.html
"""
# category: histograms
import altair as alt
from vega_datasets import data

source = data.cars()

alt.Chart(source).mark_bar().encode(
    alt.X("Horsepower:Q", bin=True),
    y='count()',
    row='Origin'
)