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"""
Bar Chart with Negative Values
==============================
This example shows a bar chart with both positive and negative values.
"""
# category: bar charts
import altair as alt
from vega_datasets import data
source = data.us_employment()
alt.Chart(source).mark_bar().encode(
x="month:T",
y="nonfarm_change:Q",
color=alt.condition(
alt.datum.nonfarm_change > 0,
alt.value("steelblue"), # The positive color
alt.value("orange") # The negative color
)
).properties(width=600)
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