Writing nested dictionaries in python for json.dump -
i have set of python lists want serially write in json file in structure given below
[ { "_id": { "$oid": "5707b5f4e4b0c4265caf3c87" }, "timestamp": 1, "tracedata": [ { "data": { "y": 443.732, "angle": 1.11416, "speed": 1.42906, "objecttype": "pedestrians", "x": 217.991, "d2d": "due_1_2" }, "id": "due_1_1" }, { "data": { "y": 571.965, "angle": 1.22555, "speed": 1.18132, "objecttype": "pedestrians", "x": 205.708, "d2d": "due_20_1" }, "id": "due_20_2" } ] }, { "_id": { "$oid": "5707b5a8e4b0a37fb1a38c57" }, "timestamp": 2, "tracedata": [ { "data": { "y": 419.936, "angle": 1.21995, "speed": 1.38648, "objecttype": "pedestrians", "x": 153.693, "d2d": "due_1_2" }, "id": "due_1_1" }, { "data": { "y": 571.143, "angle": 1.0939, "speed": 1.31394, "objecttype": "pedestrians", "x": 295.097, "d2d": "due_20_1" }, "id": "due_20_2" } ] } ] i have python lists each of variables ('y','x','angle','speed' etc.). , have created nested dictionaries in python write these lists via loop. code follows
eachdata in range(index-1): outerdict['timestamp']['tracedata']['data']['x'] = lat[eachdata] outerdict['timestamp']['tracedata']['data']['y'] = long[eachdata] outerdict['timestamp']['tracedata']['data']['angle'] = angle[eachdata] outerdict['timestamp']['tracedata']['data']['speed'] = speed[eachdata] outerdict['timestamp']['tracedata']['data']['objecttype'] = objecttype[eachdata] index = 0 out_file = open("klsimulationjson.js","w") json.dump(outerdict,out_file,indent = 4) out_file.close() this code produces following result. not able figure out 1) how iteratively populate dictionary in similar structure 2) adding values key 'timestamp'# 3) creating key - 'id'
{ "timestamp": { "tracedata": { "data": { "x": "7.739439", "speed": "6.072069", "y": "49.421938", "objecttype": "bus", "angle": "68.576206" } } } } thank help
i assuming wanted, since can't have dict {} holding values no keys:
[{ "timestamp": 1, "tracedata": [{ "data": { "y": 443.732, "angle": 1.11416, "speed": 1.42906, "objecttype": "pedestrians", "x": 217.991, "d2d": "due_1_2" }, "id": "due_1_1" }, { "data": { "y": 430.645, "angle": 1.07287, "speed": 1.41977, "objecttype": "pedestrians", "x": 234.104, "d2d": "due_1_1" }, "id": "due_1_2" }, { "data": { "y": 362.25, "angle": 1.43214, "speed": 1.44059, "objecttype": "pedestrians", "x": 50.5509, "d2d": "due_2_2" }, "id": "due_2_1" }] }, { "timestamp": 2, "tracedata": [{ "data": { "y": 443.732, "angle": 1.11416, "speed": 1.42906, "objecttype": "pedestrians", "x": 217.991, "d2d": "due_1_2" }, "id": "due_1_1" }, { "data": { "y": 430.645, "angle": 1.07287, "speed": 1.41977, "objecttype": "pedestrians", "x": 234.104, "d2d": "due_1_1" }, "id": "due_1_2" }, { "data": { "y": 362.25, "angle": 1.43214, "speed": 1.44059, "objecttype": "pedestrians", "x": 50.5509, "d2d": "due_2_2" }, "id": "due_2_1" }] }] so, list [] of dicts {} (#1), each identifying "timestamp", , "tracedata" list [] contains dicts {} (#2), each of contains "id", , "data".
your code:
eachdata in range(index-1): outerdict['timestamp']['tracedata']['data']['x'] = lat[eachdata] outerdict['timestamp']['tracedata']['data']['y'] = long[eachdata] outerdict['timestamp']['tracedata']['data']['angle'] = angle[eachdata] outerdict['timestamp']['tracedata']['data']['speed'] = speed[eachdata] outerdict['timestamp']['tracedata']['data']['objecttype'] = objecttype[eachdata] looks @ single dict (of type #1), , several errors:
- "timestamp" should identifier of trace frame, integer or string, not dict
{}, access dict anyways. - "tracedata" list
[], need access such - might contain more 1 dict{}(#2), in fact in example. - you access "data" dict , write relevant information, once again, 1 dict #1 , 1 dict #2, result appears contain 1 of each.
this how should accessed when built, more or less, can idea how fix code:
for traceframe in traceframes: print(traceframe["timestamp"]) tracedata in traceframe["tracedata"]: print(tracedata["id"], " --> ", tracedata["data"])
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