aRegius

from collections import Counter

list_of_data = [
             {'quantity': 22, 'price': 510},
             {'quantity': 32, 'price': 520},
             {'quantity': 42, 'price': 530}
]

data_counts = Counter()

for data_dict in list_of_data:
	   data_counts.update(data_dict)

>>> data_counts
Counter({'price': 1560, 'quantity': 96})

import itertools
from collections import defaultdict

temp_data = defaultdict(dict)

for item in itertools.chain(a, b):
      temp_data[item['code']].update(item)

data = list(temp_data.values())

cat_goods_dict = defaultdict(list)

for d in data[0]['sub_cats'] + data[1:]:
	  cat_goods_dict[d['cat_name']] += d['goods_inside']

new_data = [
	  {'cat_name': cat_val, 'goods_inside': goods_val}
	  for cat_val, goods_val in cat_goods_dict.items()
]

>>> for i in x:
	      print(*i, sep=', ')

from collections import defaultdict

value_index_dict = defaultdict(list)
for index, value in enumerate(rows):
      value_index_dict[value[-1]].append(index)

unique_els = []

for dict_item in els:
	  if dict_item not in unique_els:
		    unique_els.append(dict_item)

>>> '/f/' in '/name_of_product_group/product?reff=menu_main'
False
>>> '/f/' in '/name_of_product_group/product/f/category=xxx?reff=menu_main'
True

# Словарь для сортировки данных
>>> from collections import defaultdict
>>> events_dict = defaultdict(dict)
>>> for data in events_data:
	        *place, time, event = data
	        if time in events_dict[tuple(place)]:
		            events_dict[tuple(place)][time].append(event)
	        else:
		            events_dict[tuple(place)][time] = [event]

# Имеем
>>> pprint.pprint(dict(events_dict))
{('place1', 'address1'): {'time1': ['event1', 'event2']},
 ('place2', 'address2'): {'time1': ['event1'],
                          'time2': ['event1', 'event2', 'event3']},
 ('place3', 'address3'): {'time1': ['event1'],
                          'time2': ['event1', 'event2', 'event3']}}

# Выводим на печать
>>> for place in events_dict:
	        print('\nPlace: {}\nAddress: {}'.format(*place))	
	        for time, events_in_time in events_dict[place].items():
		            print('Time: ', time)
		            print(('Event: {}\n' * len(events_in_time)).format(*events_in_time), end='')

from collections import defaultdict
dict_result = defaultdict(list)
for index, key in enumerate(id_master):
        dict_result[key].append(index)