如何用其他字典中的值累积更新字典？

Question

我有一个主词典来保持整个语料库的单词频率，而各个词典则要为每个文本文件保持单词频率。我遍历每个文件，生成每个文件的WF，然后依次更新主词典。我的代码如下。有捷径吗？谢谢！

 master_dict = {}
 for txtfile in txtfiles:
    file_dict = {}
    file_dict = get_word_freq(txtfile) #A function is defined
    for k, v in file_dict.items():
        if k in master_dict:
             master_dict[k] += v
        else:
             master_dict[K] = v

Answer 1

您应该考虑使用python拥有的“ Counter”类。

from collections import Counter

words_a = 'one two three'
words_b = 'one two one two'
words_c = 'three four five'

a = Counter(words_a.split())
b = Counter(words_b.split())
c = Counter(words_c.split())

print(a + b + c)
# outputs Counter({'one': 3, 'two': 3, 'three': 2, 'four': 1, 'five': 1})