Gantt Chart

This example shows how to make a simple Gantt chart.

Method syntax

import altair as alt
import pandas as pd

source = pd.DataFrame([
    {"task": "A", "start": 1, "end": 3},
    {"task": "B", "start": 3, "end": 8},
    {"task": "C", "start": 8, "end": 10}
])

alt.Chart(source).mark_bar().encode(
    x='start',
    x2='end',
    y='task'
)

Attribute syntax

import altair as alt
import pandas as pd

source = pd.DataFrame([
    {"task": "A", "start": 1, "end": 3},
    {"task": "B", "start": 3, "end": 8},
    {"task": "C", "start": 8, "end": 10}
])

alt.Chart(source).mark_bar().encode(
    x='start',
    x2='end',
    y='task'
)
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.