Dual axes chart

import easychart

chart = easychart.new(tooltip="shared")
chart.title = "Average Monthly Temperature and Rainfall in Tokyo"
chart.subtitle = "Source: WorldClimate.com"
chart.categories = [
    "Jan",
    "Feb",
    "Mar",
    "Apr",
    "May",
    "Jun",
    "Jul",
    "Aug",
    "Sep",
    "Oct",
    "Nov",
    "Dec",
]

# add two axes
chart.yAxis.append(title={"text": "Temperature"}, labels={"format": "{value}°C"})
chart.yAxis.append(
    title={"text": "Rainfall"}, labels={"format": "{value} mm"}, opposite=True
)

chart.plot(
    [49.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
    name="Rainfall",
    type="column",
    yAxis=1,
    tooltip={"valueSuffix": "mm"},
)
chart.plot(
    [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6],
    name="Temperature",
    type="spline",
    yAxis=0,
    tooltip={"valueSuffix": "°C"},
)
chart