In [11]:

    

from vega import Vega


    

In [13]:

    

Vega({
  "width": 900,
  "height": 560,
  "padding": {"top": 25, "left": 0, "right": 0, "bottom": 0},

  "data": [
    {
      "name": "states",
      "url": "data/us-10m.json",
      "format": {"type": "topojson", "feature": "states"},
      "transform": [
        {
          "type": "geopath", "projection": "albersUsa",
          "scale": 1200, "translate": [450, 280]
        }
      ]
    },
    {
      "name": "traffic",
      "url": "data/flights-airport.csv",
      "format": {"type": "csv", "parse": "auto"},
      "transform": [
        {
          "type": "aggregate", "groupby": ["origin"],
          "summarize": [{"field": "count", "ops": ["sum"], "as": ["flights"]}]
        }
      ]
    },
    {
      "name": "airports",
      "url": "data/airports.csv",
      "format": {"type": "csv", "parse": "auto"},
      "transform": [
        {
          "type": "lookup", "on": "traffic", "onKey": "origin",
          "keys": ["iata"], "as": ["traffic"]
        },
        {
          "type": "filter",
          "test": "datum.traffic != Null"
        },
        {
          "type": "geo", "projection": "albersUsa",
          "scale": 1200, "translate": [450, 280],
          "lon": "longitude", "lat": "latitude"
        },
        {
          "type": "filter",
          "test": "datum.layout_x != Null && datum.layout_y != Null"
        },
        { "type": "sort", "by": "-traffic.flights" },
        { "type": "voronoi", "x": "layout_x", "y": "layout_y" }
      ]
    },
    {
      "name": "routes",
      "url": "data/flights-airport.csv",
      "format": {"type": "csv", "parse": "auto"},
      "transform": [
        { "type": "filter", "test": "hover && hover.iata == datum.origin" },
        {
          "type": "lookup", "on": "airports", "onKey": "iata",
          "keys": ["origin", "destination"], "as": ["_source", "_target"]
        },
        { "type": "filter", "test": "datum._source && datum._target" },
        { "type": "linkpath" }
      ]
    }
  ],

  "scales": [
    {
      "name": "size",
      "type": "linear",
      "domain": {"data": "traffic", "field": "flights"},
      "range": [16, 1000]
    }
  ],

  "signals": [
    {
      "name": "hover", "init": null,
      "streams": [
        {"type": "@cell:mouseover", "expr": "datum"},
        {"type": "@cell:mouseout", "expr": "null"}
      ]
    },
    {
      "name": "title", "init": "U.S. Airports, 2008",
      "streams": [{
        "type": "hover", 
        "expr": "hover ? hover.name + ' (' + hover.iata + ')' : 'U.S. Airports, 2008'"
      }]
    },
    {
      "name": "cell_stroke", "init": null,
      "streams": [{"type": "dblclick", "expr": "cell_stroke ? null : 'brown'"}]
    }
  ],

  "marks": [
    {
      "type": "path",
      "from": {"data": "states"},
      "properties": {
        "enter": {
          "fill": {"value": "#dedede"},
          "stroke": {"value": "white"}
        },
        "update": {
          "path": {"field": "layout_path"}
        }
      }
    },
    {
      "type": "symbol",
      "from": {"data": "airports"},
      "properties": {
        "enter": {
          "size": {"scale": "size", "field": "traffic.flights"},
          "fill": {"value": "steelblue"},
          "fillOpacity": {"value": 0.8},
          "stroke": {"value": "white"},
          "strokeWidth": {"value": 1.5}
        },
        "update": {
          "x": {"field": "layout_x"},
          "y": {"field": "layout_y"}
        }
      }
    },
    {
      "type": "path",
      "name": "cell",
      "from": {"data": "airports"},
      "properties": {
        "enter": {
          "fill": {"value": "transparent"},
          "strokeWidth": {"value": 0.35}
        },
        "update": {
          "path": {"field": "layout_path"},
          "stroke": {"signal": "cell_stroke"}
        }
      }
    },
    {
      "type": "path",
      "interactive": false,
      "from": {"data": "routes"},
      "properties": {
        "enter": {
          "path": {"field": "layout_path"},
          "stroke": {"value": "black"},
          "strokeOpacity": {"value": 0.35}
        }
      }
    },
    {
      "type": "text",
      "interactive": false,
      "properties": {
        "enter": {
          "x": {"value": 895},
          "y": {"value": 0},
          "fill": {"value": "black"},
          "fontSize": {"value": 20},
          "align": {"value": "right"}
        },
        "update": {
          "text": {"signal": "title"}
        }
      }
    }
  ]
})


    

    




---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-13-6a567de24f7f> in <module>()
     80   "signals": [
     81     {
---> 82       "name": "hover", "init": null,
     83       "streams": [
     84         {"type": "@cell:mouseover", "expr": "datum"},

NameError: name 'null' is not defined

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