爲具有多個值的Python字典

Question

想查找彙總統計我有一本字典：

a_dic = {'file1':["a","b","c"], 
    'file2':["b","c","d"], 
    'file3':["c","d","e"]} 

我想編寫一個函數能夠返回字典/數據框中找到像按鍵的發生：

occurrence = {'a':1, 'b':2, 'c':3, 'd':2,'e':1} 

Answer 1

隨着collections.Counter對象和itertools.chain.from_iterable功能：

import collections, itertools 

a_dic = {'file1':["a","b","c"], 'file2':["b","c","d"], 'file3':["c","d","e"]} 
result = dict(collections.Counter(itertools.chain.from_iterable(a_dic.values()))) 

print(result) 

輸出：

{'c': 3, 'e': 1, 'b': 2, 'd': 2, 'a': 1} 

Answer 2

from collections import Counter 
flat_list = [item for sublist in (a_dic.values()) for item in sublist] 
print(Counter(flat_list)) 

輸出

Counter({'c': 3, 'b': 2, 'd': 2, 'a': 1, 'e': 1})