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Can someone explain the following python code.

value_geojson["features"][0]["properties"]["title"]

value_geojson is a geojson variable. I like to think that I'm not a total python newbie but these are too many [] for me. I am a GeoJSON newbie though.

Would appreciate help on that one, eventhough I know it's probably to simple for SE

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See sections 3.2 and 3.3 of the geojson standard.

It looks like value_geojson is a FeatureCollection object, which have a single member "features" which is a list of Feature objects. So

value_geojson["features"][0]

is now just the first Feature object. Those have a few members, including "properties", which is an arbitrary JSON object. At that point we're outside of the geojson standard, so whatever "title" means is more context-specific.

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  • $\begingroup$ ok that already helped me a bit. So, "value_geojson["features"][0]" returns the first Object in value_geojson. Each Object is basically a python dictionary with the keys "properties" and "title". Thus, the full line returns the values of both keys for the first Object? In the tutorial I saw that line it returns "5000.00 ". Thus, "5000.00" is the value stored in "Properties" and " " is the value stored in "title"? $\endgroup$ Commented Jan 11, 2021 at 19:23
  • $\begingroup$ No, those last two are also nested. ...["properties"] is itself a dictionary, probably with many key-value pairs, one of which is evidently (very strangely) "title": "5000.00". Try printing value_geojson["features"][0]["properties"].keys(). $\endgroup$ Commented Jan 11, 2021 at 19:37
  • $\begingroup$ Ok I understand. Thanks a lot :). When I run your line I get: dict_keys(['fill', 'fill-opacity', 'stroke', 'stroke-opacity', 'stroke-width', 'title']). Thus, yes title has apparently the value "5000.00". $\endgroup$ Commented Jan 11, 2021 at 19:51

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