在字典列表中写入值

Question

我正在尝试遍历字典列表并将值写入此特定字典：

from model.statistic_model import Sher, Op, Npp

TODAY = "today"
OVERALL = "overall"
SHER = "sherlock"
OP = "oprisk"
NPP = "npp"

popular_search_terms = {SHER: {TODAY: {}, OVERALL: {}}, OP: {TODAY: {}, OVERALL: {}}, NPP: {TODAY: {}, OVERALL: {}}}
engines = [Sher, Op, Npp]   
engines_container_overall = [popular_search_terms[SHER][OVERALL], popular_search_terms[OP][OVERALL], popular_search_terms[NPP][OVERALL]]

try:
    for index, engine in enumerate(engines):
        engines_container_overall[index] = df.get_popular_searchterms(False, engine)
except Exception as e:
    print(e)
    for index, engine in enumerate(engines):
        engines_container_overall[index] = pd.DataFrame()

当我访问我的列表并打印以下内容时，我会收到我想要的值。

print(engines_container_overall[0])

但是，如果我想打印特定字典的值，例如popular_search_terms[SHER][OVERALL] ，则该值为无。

如何成功地将数据添加到列表中的特定字典？

Answer 1

您不必通过列表进行操作。 Python 只在列表中保存对字典的引用。 您可以使用update功能直接修改您的字典。

比方说

popular_search_terms = {SHER:{OVERALL:{"Test_SHER_overall":20}}}    
print(engines_container_overall[0])

产生{'Test_SHER_overall': 20}

现在更新字典

popular_search_terms[SHER][OVERALL].update({"Test_SHER_overall2":21})

和print(engines_container_overall[0])产生{'Test_SHER_overall': 20, 'Test_SHER_overall2': 21}