python defaultdict 28list 29

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1>>> s = [('yellow', 1), ('blue', 2), ('yellow', 3), ('blue', 4), ('red', 1)]
2>>> d = defaultdict(list)
3>>> for k, v in s:
4...     d[k].append(v)
5...
6>>> d.items()
7[('blue', [2, 4]), ('red', [1]), ('yellow', [1, 3])]
8

1>>> from collections import defaultdict
2>>> food_list = 'spam spam spam spam spam spam eggs spam'.split()
3>>> food_count = defaultdict(int) # default value of int is 0
4>>> for food in food_list:
5...     food_count[food] += 1 # increment element's value by 1
6...
7defaul

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