python defaultdict default value

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showing results for - "python defaultdict default value"
Marco
24 Oct 2019
1# set default values for all keys
2d = collections.defaultdict(lambda:1)
3# set default value for a key if not exist
4value = d.get(key,default_value)
Camila
16 Aug 2016
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
source
Viktoria
26 Jul 2017
1d = defaultdict(lambda:1)
source
Arrie
17 Nov 2019
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...
7defaultdict(<type 'int'>, {'eggs': 1, 'spam': 7})
8>>>
Carla
05 Jan 2017
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])]
Esteban
26 Sep 2017
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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