如何访问嵌套Python字典中的特定值?

Question

我正在尝试找出如何过滤状态为" await _delivery "的字典。我不确定如何做到这一点(或者如果这是不可能的)。我是python和编程的新手。我在Ubuntu 20.04上的VS Code上使用Python 3.8.5。下面的数据是我创建的样本数据，类似于来自API的json数据。关于如何过滤"状态"有什么帮助吗?太好了。谢谢你。

nested_dict = {
'list_data': [
{
'id': 189530,
'total': 40.05,
'user_data': {
'id': 1001,
'first_name': 'jane',
'last_name': 'doe'
},
'status': 'future_delivery'
},
{
'id': 286524,
'total': 264.89,
'user_data': {
'id': 1002,
'first_name': 'john',
'last_name': 'doe'
},
'status': 'awaiting_delivery'
},
{
'id': 368725,
'total': 1054.98,
'user_data': {
'id': 1003,
'first_name': 'chris',
'last_name': 'nobody'
},
'status': 'awaiting_delivery'
},
{
'id': 422955,
'total': 4892.78,
'user_data': {
'id': 1004,
'first_name': 'mary',
'last_name': 'madeup'
},
'status': 'future_delivery'
}
],
'current_page': 1,
'total': 2,
'first': 1,
'last': 5,
'per_page': 20
}
#confirm that nested_dict is a dictionary
print(type(nested_dict))
#create a list(int_list) from the nested_dict dictionary
int_list = nested_dict['list_data']
#confirm that int_list is a list
print(type(int_list))
#create the int_dict dictionary from the int_list list
for int_dict in int_list:
print(int_dict)
#this is my attempt at filtering the int_dict dictionar for all orders with a status of awaiting_delivery
for order in int_dict:
int_dict.get('status')
print(order)

终端输出如下:

<class 'dict'>
<class 'list'>
{'id': 189530, 'total': 40.05, 'user_data': {'id': 1001, 'first_name': 'jane', 'last_name': 'doe'}, 'status': 'future_delivery'}
{'id': 286524, 'total': 264.89, 'user_data': {'id': 1002, 'first_name': 'john', 'last_name': 'doe'}, 'status': 'awaiting_delivery'}
{'id': 368725, 'total': 1054.98, 'user_data': {'id': 1003, 'first_name': 'chris', 'last_name': 'nobody'}, 'status': 'awaiting_delivery'}
{'id': 422955, 'total': 4892.78, 'user_data': {'id': 1004, 'first_name': 'mary', 'last_name': 'madeup'}, 'status': 'future_delivery'}
id
total
user_data
status

Answer 1

您可以通过对字典列表执行条件列表推导来获得一个过滤后的字典列表:

# filter the data
list_data_filtered = [entry for entry in nested_dict['list_data']
if entry['status'] == 'awaiting_delivery']
# print out the results
for entry in list_data_filtered:
print(entry)
# results
# {'id': 286524, 'total': 264.89, 'user_data': {'id': 1002, 'first_name': 'john', 'last_name': 'doe'}, 'status': 'awaiting_delivery'}
# {'id': 368725, 'total': 1054.98, 'user_data': {'id': 1003, 'first_name': 'chris', 'last_name': 'nobody'}, 'status': 'awaiting_delivery'}