[英]Compare list item with a dictionary key and print out the value of the key if the item exists in the dictionary
示例代碼:
my_dict = {'ABC':'Apple','DEF':'Mango','GHI':'Pear','JKL':'Orange','MNO':'Plum'}
lst_x = ['DEF','GHI']
預期結果:
['Mango', 'Pear']
您可以使用operator.itemgetter
一次檢索多個鍵:
from operator import itemgetter
my_dict = {'ABC':'Apple','DEF':'Mango','GHI':'Pear','JKL':'Orange','MNO':'Plum'}
lst_x = ['DEF','GHI']
# in case, if there's a chance, that lst_x would get some of the keys, that are not in my_dict - add the below line:
# lst_x=set(lst_x).intersection(set(my_dict.keys()))
res=itemgetter(*lst_x)(my_dict)
輸出:
>>> res
('Mango', 'Pear')
你可以使用一個簡單的循環,詢問是否有一個具有相同值的鍵並打印它,例如:
my_dict = {'ABC':'Apple','DEF':'Mango','GHI':'Pear','JKL':'Orange','MNO':'Plum'}
lst = ['ABC','DEF','GHI','JKL','MNO']
for key in lst:
if key in my_dict.keys():
print(key, '->' , my_dict[key])
>>> ABC -> Apple
>>> DEF -> Mango
>>> GHI -> Pear
>>> JKL -> Orange
>>> MNO -> Plum
一種方法是使用list comprehension
來構建請求的列表。
本質上,我們在外循環中遍歷list
,在內循環中遍歷dictionary
,然后將list
值與dictionary
的key
進行比較,如果匹配,則將關聯key
的值保存在新的輸出列表。
下面的代碼片段按上述方式工作:
my_dict = {'ABC':'Apple','DEF':'Mango','GHI':'Pear','JKL':'Orange','MNO':'Plum'}
lst_x = ['DEF','GHI']
out = [value for element in lst_x for key, value in my_dict.items() if element == key]
print(out)
運行時打印:
['Mango', 'Pear']
我個人不相信給出直接的答案,所以我會給你一個提示:
// for x in lst:
// if x in dictionary then
// lst_x.append(x)
我相信這應該足以讓你弄清楚其余的。
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