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%load_ext py_d3

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%%d3
<script>
function pyexec(command) {
    return new Promise(res => {
        IPython.notebook.kernel.execute(command,
            {iopub: {
                output: 
                    out => res(JSON.parse(eval(out.content.data["text/plain"])))
            }}, 
            {silent: false});
    });
}
</script>

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import json
import numpy as np
def get_data(count):
    return json.dumps((np.random.rand(count)*10).tolist())

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%%d3
<g></g>
<style>
element {
    height: 25px;
}
div.bar {
    display: inline-block;
    width: 20px;
    height: 75px;
    margin-right: 2px;
    background-color: teal;
}
</style>

<script>
pyexec("get_data(10)")
.then(dataset => {
    d3.select("g").selectAll("div")
    .data(dataset)
    .enter()
    .append("div")
    .attr("class", "bar")
    .style("height", d => {
        let barHeight = d * 5;
        return barHeight + "px";
    });
});

</script>

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