[Solved] How to compare a nested list of Dicts to another nested list of Dicts and update the values in one from the other

by


I may have been massively over complicating things here, this appears to do what I want (ignoring the insertion of completely new markets / selection_id’s for now):

new_order_list = []

for x in updated_orders:
    for y in x['Live_orders']:
        orders_to_update = {}
        orders_to_update.update({'Market_id': x['Market_id'],
                                'Selection_id': y['selection_id'],
                                'live_orders': y['live_orders']})
        new_order_list.append(orders_to_update)

for z in new_order_list:
    for a in original_state:
        for b in a['position_list']:
                if z['Market_id'] == b['Market_id'] and z['Selection_id'] == b['Selection_id']:
                    #for c in b['Orders']:
                    print(b['Market_id'], b['Selection_id'], z['live_orders'])
                    b.update({'Orders': z['live_orders']})

I must have missed the obvious solution and was looking for something far too complex, but hopefully this will help someone else as this must be a fairly common problem (yet with very few posts on the solution)!

Here is how I tackled the updates where the orders were not in the original_state:

uo_list = []

for i in updated_orders:
    uo_list.append(i['Market_id'])

os_list = []

for j in original_state:
    os_list.append(j['Market_id'])

new_list = list(set(uo_list).difference(os_list))

for i in updated_orders:
    for j in new_list:
        if i['Market_id'] == j:
            print('Append this as required', i)

solved How to compare a nested list of Dicts to another nested list of Dicts and update the values in one from the other