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Dash plot visualization from CoCalc project

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# Demo of Dash in a CoCalc project
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# Dash tutorial:
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#   https://dash.plot.ly/getting-started
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# CoCalc HTTP server from a project
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#   https://doc.cocalc.com/howto/webserver.html
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# Blog articles about Dash with CoCalc
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#   REVISED:  https://blog.cocalc.com/cocalc/python/2021/05/03/dash-with-cocalc.html
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#   OUTDATED: https://blog.cocalc.com/cocalc/python/2018/06/08/dash-with-cocalc.html
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#
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# 1. Run this file from a .term:
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#   python3 dash-demo.py
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# 2. When the program runs in the terminal, it will print a URL like this:
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#   https://cocalc.com/<your project id>/server/9990
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# i.e. if your project id is 30b9a512-6b2c-11e8-a361-4f5344355d2c, the link would be
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#   https://cocalc.com/30b9a512-6b2c-11e8-a361-4f5344355d2c/server/9990
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# Open a new browser tab to the link that is printed.
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# You must be a collaborator on the project and logged into your CoCalc account
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# to view the application.
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import dash
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import dash_core_components as dcc
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import dash_html_components as html
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import os
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cocalc_project_id = os.environ['COCALC_PROJECT_ID']
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port = 9990
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pfx = "/{}/server/{}/".format(cocalc_project_id, port)
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app = dash.Dash(requests_pathname_prefix = pfx)
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app.layout = html.Div(children=[
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    html.H1(children='Hello Dash from CoCalc'),
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    html.Div(children='''
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        Dash: A web application framework for Python.
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    '''),
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    dcc.Graph(
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        id='example-graph',
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        figure={
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            'data': [
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                {'x': [1, 2, 3], 'y': [4, 1, 2], 'type': 'bar', 'name': 'SF'},
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                {'x': [1, 2, 3], 'y': [2, 4, 5], 'type': 'bar', 'name': u'Montréal'},
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            ],
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            'layout': {
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                'title': 'Dash Data Visualization'
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            }
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        }
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    )
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])
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if __name__ == '__main__':
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    print("browse to: https://cocalc.com{}".format(pfx))
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    app.run_server(debug=True, port=port, host='0.0.0.0')
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