迭代數組

Question

我的字典[{'abc':10,'efg':20,'def':30},{'abc':40,'xya':20,'def':50}]的名單，我想在創建一個數組abc[]並存儲相應的值array.so輸出應該看起來像

abc[10,40] 
def[30,50] 
efg[20] 

等字典和儲值上，使用python。

Answer 1

任何確切的解決方案可能會涉及到的exec（）或東西的陌生人，最Python程序員可能會鼓勵你，而不是改變你的詞典列表插入列表的詞典：

from collections import defaultdict 

list_of_dictionaries = [ 
    {'abc':10,'efg':20,'def':30}, 
    {'abc':40,'xya':20,'def':50}, 
] 

dictionary_of_lists = defaultdict(list) 

# there's probably some clever one liner to do this but let's keep 
# it simple and clear what's going when we make the transfer: 

for dictionary in list_of_dictionaries: 
    for key, value in dictionary.items(): 
     dictionary_of_lists[key].append(value) 

# We've achieved the goal, now just dump dictionary_of_lists to prove it: 

for key, value in dictionary_of_lists.items(): 
    print(key, value) 

，輸出：

xya [20] 
def [30, 50] 
abc [10, 40] 
efg [20] 

不完全是你要求的，但應該是，爲了大多數目的，你需要什麼。