Python: Ordering Nested Dictionaries

Question

I want to order some nested dictionaries to match the order of this list:

vehicle_type = ['Car', 'Bike', 'Bus']

This is currently what the nested dictionary looks like:

vehicles = {'2018': {'Bike': 2542, 'Bus': 37, 'Car': 33432}, '2012': {'Car': 68122, 'Bike': 164, 'Bus': 1653}, '2001': {'Car': 12127, 'Bus': 324, 'Bike': 4222}}

I have organised the outer keys which represent the years with:

ordered_dict = [(k, vehicles[k]) for k in sorted(list(vehicles.keys()))]

I'm just unsure on how I go through each year and organise their keys to the order of my vehicle_type list? I'm probably being dumb

Given a dict D with the right keys but arbitrary order, {key: D[key] for key in vehicle_type} would produce a new dict in the right order. Change to {key: D.get(key) for ... if some of the dicts might have missing keys (which this code would turn into explicit Nones). — jasonharper
– jasonharper, Commented May 5, 2021 at 0:18

PacketLoss · Accepted Answer · 2021-05-05 00:22:20Z

2

We can use a dict comprehension to re-order your keys based on your input list.

new_vehicles = {key: {d: v.get(d) for d in vehicle_type} for key, v in vehicles.items()}

new_vehicles
#{'2018': {'Car': 33432, 'Bike': 2542, 'Bus': 37}, '2012': {'Car': 68122, 'Bike': 164, 'Bus': 1653}, '2001': {'Car': 12127, 'Bike': 4222, 'Bus': 324}}

answered May 5, 2021 at 0:22

PacketLoss

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Anonymous Over a year ago

This worked perfectly! Was so close by the methods I was trying haha

David C. · Accepted Answer · 2021-05-05 01:29:31Z

0

If you want a dict like

{'Bike': {'2001', 164, '2012', 4222, '2018', 2542}, 'Bus': {'2001', 324, 37, 1653, '2012', '2018'}, 'Car': {'2001', 33432, '2012', 68122, '2018', 12127}}

you should write something like

vehicles_by_type = {}
for year, vehicle_in_year in vehicles.items():
    for vehicle_type, x in vehicle_in_year.items():
        if not vehicle_type in vehicles_by_type:
            vehicles_by_type[vehicle_type] = {}
        vehicles_by_type[vehicle_type].update({year, x})

answered May 5, 2021 at 1:29

David C.

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