Python|具有相同键的字典的总和列表
您已经给出了一个字典列表,任务是返回一个字典,其总和值具有相同的键。
让我们讨论完成任务的不同方法。
方法 #1:使用reduce() + operator
# Python code to demonstrate
# return the sum of values of dictionary
# with same keys in list of dictionary
import collections, functools, operator
# Initialising list of dictionary
ini_dict = [{'a':5, 'b':10, 'c':90},
{'a':45, 'b':78},
{'a':90, 'c':10}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# sum the values with same keys
result = dict(functools.reduce(operator.add,
map(collections.Counter, ini_dict)))
print("resultant dictionary : ", str(result))
输出:
initial dictionary [{‘b’: 10, ‘a’: 5, ‘c’: 90}, {‘b’: 78, ‘a’: 45}, {‘a’: 90, ‘c’: 10}]
resultant dictionary : {‘b’: 88, ‘a’: 140, ‘c’: 100}
方法#2:使用计数器
# Python code to demonstrate
# return the sum of values of dictionary
# with same keys in list of dictionary
import collections
# Initialising list of dictionary
ini_dict = [{'a':5, 'b':10, 'c':90},
{'a':45, 'b':78},
{'a':90, 'c':10}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# sum the values with same keys
counter = collections.Counter()
for d in ini_dict:
counter.update(d)
result = dict(counter)
print("resultant dictionary : ", str(counter))
输出:
initial dictionary [{‘c’: 90, ‘a’: 5, ‘b’: 10}, {‘a’: 45, ‘b’: 78}, {‘a’: 90, ‘c’: 10}]
resultant dictionary : Counter({‘a’: 140, ‘c’: 100, ‘b’: 88})
方法#3:朴素的方法
# Python code to demonstrate
# return the sum of values of dictionary
# with same keys in list of dictionary
from operator import itemgetter
# Initialising list of dictionary
ini_dict = [{'a':5, 'b':10, 'c':90},
{'a':45, 'b':78},
{'a':90, 'c':10}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# sum the values with same keys
result = {}
for d in ini_dict:
for k in d.keys():
result[k] = result.get(k, 0) + d[k]
print("resultant dictionary : ", str(result))
输出:
initial dictionary [{‘b’: 10, ‘c’: 90, ‘a’: 5}, {‘b’: 78, ‘a’: 45}, {‘c’: 10, ‘a’: 90}]
resultant dictionary : {‘b’: 88, ‘c’: 100, ‘a’: 140}